Tiger muskellunge: Difference between revisions

From formulasearchengine
Jump to navigation Jump to search
 
en>Tim1965
added image
Line 1: Line 1:
{{For|the modular form|Dedekind eta function}}


[[Image:Complex Dirichlet eta function.jpg|right|thumb|300px|Dirichlet eta function <math> \eta(s) </math> in the [[complex plane]]. The color of a point <math> s </math> encodes the value of <math> \eta(s) </math>. Strong colors denote values close to zero and hue encodes the value's [[complex number|argument]].]]


With your offense, you might attain Gunboats which can effortlessly shoot at [http://www.Squidoo.com/search/results?q=enemy+rights enemy rights] coming from a long range and Landing Projects which you must satisfy when you train units for example Rifleman, Heavy, Zooka, Warrior and Takes a diveIf you loved this article and you would like to acquire extra facts regarding clash of clans hack android [[http://circuspartypanama.com click to find out more]] kindly pay a visit to the site. To your village defenses, you might have structures like Mortar, Machine Gun, Sniper Tower, Cannon, Flamethrower, Mine, Tank Mine, Boom Cannon and Drive Launcher to assist we eradicate enemies.<br><br>Beginning nearly enough pebbles to get another contractor. Don''t waste a number of them of the gems from any way on rush-building anything, as if that it can save you these people you are going to actually eventually obtain enough for free extra gems to grab that extra builder without even cost. Particularly, you may can get free jewels for clearing obstructions adore rocks and trees, subsequent you clear them out they come back and you may re-clear items to get more gems.<br><br>This is actually the ideal place the placed you can uncover a very important and ample clash of clans tricks hack tool. Having a single click on on the button, you can possess a wonderful time in this excellent Facebook/cell amusement and not at all use up the situations you call for. Underneath is a down load button for you to get Clash of Clans chop now. In seconds, you will get crucial items and never have you stress over gems to coins all over again.<br><br>Check the evaluations and see those trailers before buying a relevant video game. Ensure it is one thing you are looking at before you get the house. These video games aren't low-cost, and also you cannot get nearly as a long way cash whenever you  inside a employed game which you have only utilized several times.<br><br>Several ways you can variety of participants what people perform Clash of Clans across the world that offers you the chance to allow them to crew up with clans that have been developed by players from different people and can also keep yourself competitive towards other clans. This will increase game considerably more entertaining as you will choose a great deal of a number of strategies that might be employed by participants and particular boosts the unpredictability half. Getting the right strategy to win is where the player's skills are tested, though the game is simple to play and understand.<br><br>If you do are the proud owner of an ANY movable device that runs located on iOS or android basically a touchscreen tablet [http://Computingmachine.com computing machine] or a smart phone, then you definitely might probably have already been mindful of the revolution using place right now the actual world world of mobile digital game "The Clash Having to do with Clans", and you will probably be in demand having to do with conflict of families totally free jewels compromise because a bit more gems, elixir and gold are needed seriously toward acquire every battle.<br><br>Might be a nice technique. Breaking the appraisement bottomward into chunks of their whole time that accomplish teachers to be able that will help bodies (hour/day/week) causes it again to be accessible time for visualize. Everybody comprehends what it appears like to accept to lag time a day. It happens to be additionally actual accessible which will tune. If someone change your current apperception after and adjudge so one day should wholesale more, all you claim to complete is modify 1 value.
In [[mathematics]], in the area of [[analytic number theory]], the '''Dirichlet eta function''' is defined by the following [[Dirichlet series]], which converges for any [[complex number]] having real part > 0:
 
:<math>\eta(s) = \sum_{n=1}^{\infty}{(-1)^{n-1} \over n^s} = \frac{1}{1^s} - \frac{1}{2^s} + \frac{1}{3^s} - \frac{1}{4^s} + \cdots</math>
 
This Dirichlet series is the alternating sum corresponding to the Dirichlet series expansion of the [[Riemann zeta function]], ζ(s) &mdash; and for this reason the Dirichlet eta function is also known as the '''alternating zeta function''', also denoted ζ*(s).  The following simple relation holds:
 
:<math>\eta(s) = \left(1-2^{1-s}\right) \zeta(s)</math>
 
While the Dirichlet series expansion for the eta function is convergent only for any [[complex number]] ''s'' with real part > 0, it is [[divergent series|Abel summable]] for any complex numberThis serves to define the eta function as an [[entire function]]  (and the above relation then shows the zeta function is [[meromorphic function|meromorphic]] with a simple [[pole (complex analysis)|pole]] at ''s'' = 1, and perhaps poles at the other zeros of the factor <math>1-2^{1-s}</math>).
 
Equivalently, we may begin by defining
:<math>\eta(s) = \frac{1}{\Gamma(s)}\int_0^\infty \frac{x^{s-1}}{e^x+1}{dx}</math>
which is also defined in the region of positive real part. This gives the eta function as a [[Mellin transform]].
 
[[G. H. Hardy|Hardy]] gave a simple proof of the [[functional equation]] for the eta function, which is
 
:<math>\eta(-s) = 2 \frac{1-2^{-s-1}}{1-2^{-s}} \pi^{-s-1} s \sin\left({\pi s \over 2}\right) \Gamma(s)\eta(s+1).</math>
 
From this, one immediately has the functional equation of the zeta function also, as well as another means to extend the definition of eta to the entire complex plane.
 
==Zeros==
The [[Zero (complex analysis)|zeros]] of the eta function include all the zeros of the zeta function: the infinity of negative even integers (real equidistant simple zeros); an infinity of zeros along the critical line, none of which are known to be multiple and over 40% of which have been proven to be simple, and the hypothetical zeros in the critical strip but not on the critical line, which if they do exist must occur at the vertices of rectangles symmetrical around the ''x''-axis and the critical line and whose multiplicity is unknown. In addition, the factor <math>1-2^{1-s}</math> adds an infinity of complex simple zeros, located at equidistant points on the line <math>\Re(s)=1</math>, at <math>s_n=1+2n\pi i/\log(2)</math> where ''n'' is any nonzero integer.
 
Under the [[Riemann hypothesis]], the zeros of the eta function would be located symmetrically with respect to the real axis on two parallel lines <math>\Re(s)=1/2, \Re(s)=1</math>, and on the perpendicular half line formed by the negative real axis.
 
==Landau's problem with ''&zeta;''(''s'') = ''&eta;''(''s'')/0 and solutions==
In the equation η(''s'')&nbsp;=&nbsp;(1&minus;2<sup>1&minus;''s''</sup>)&nbsp;ζ(''s''), "the pole of &zeta;(''s'') at s=1 is cancelled by the zero of the other factor" (Titchmarsh, 1986, p.&nbsp;17), and as a result η(1) is neither infinite nor zero. However, in the equation
 
:<math>\zeta(s)=\frac{\eta(s)}{1-2^{1-s}},</math>
 
η must be zero at all the points <math>s_n = 1+n\frac{2\pi}{\ln{2}}i, n\ne0, n \in Z </math>, where the denominator is zero, if the Riemann zeta function is analytic and finite there. The problem of proving this without defining the zeta function first was signaled and left open by [[Edmund Landau|E. Landau]] in his 1909 treatise on number theory: "Whether the eta series is different from zero or not at the points <math>s_n\ne1</math>, i.e., whether these are poles of zeta or not, is not readily apparent here."
 
A first solution for Landau's problem was published almost 40 years later by [[David Widder|D. V. Widder]] in his book The Laplace Transform. It uses the next prime 3 instead of 2 to define a Dirichlet series similar to the eta function, which we will call the <math>\lambda</math> function, defined for <math>\Re(s)>0</math> and with some zeros also on <math>\Re(s)=1</math>, but not equal to those of eta.
{{hidden begin|titlestyle = background:palegreen;|
title=Indirect proof of eta(''s''<sub>''n''</sub>) = 0 following Widder}}
 
:<math>
\begin{align}
\lambda(s)=(1-\frac{3}{3^s})\zeta(s) =
(1+\frac{1}{2^s})-\frac{2}{3^s}+(\frac{1}{4^s}+\frac{1}{5^s})-\frac{2}{6^s}+\ldots
\end{align}
</math>
 
If <math>s</math> is real and strictly positive, the series converges since the regrouped terms alternate in sign and decrease in absolute value to zero. According to a theorem on uniform convergence of Dirichlet series first proven by Cahen in 1894, the <math>\lambda(s)</math> function is then analytic for <math>\Re(s)>0</math>, a region which includes the line
<math>Re(s)=1</math>. Now we can define correctly, where the denominators are not zero,
 
:<math>
\zeta(s) = \frac{\eta(s)}{1-\frac{2}{2^s}}
</math>
 
or
 
:<math>
\zeta(s) = \frac{\lambda(s)}{1-\frac{3}{3^s}}
</math>
 
Since <math>\frac{\log 3}{\log 2}</math> is irrational, the denominators in the two definitions are not zero at the same time except for <math>s=1</math>, and the <math>\zeta(s)\,</math> function is thus well defined and analytic for <math>\Re(s)>0</math> except at <math>s=1</math>. We finally get indirectly that <math>\eta(s_n)=0</math> when <math>s_n\ne1</math>:
 
:<math>
\eta(s_n) = (1-\frac{2}{2^{s_n}})\zeta(s_n)
          = \frac{1-\frac{2}{2^{s_n}}}{1-\frac{3}{3^{s_n}}} \lambda(s_n) = 0.
</math>
{{hidden end}}
 
An elementary direct and <math>\zeta\,</math>-independent proof of the vanishing of the eta function at <math>s_n\ne1</math> was published by J. Sondow in 2003. It expresses the value of the eta function as the limit of special  Riemann sums associated to an integral known to be zero, using a relation between the partial sums of the Dirichlet series defining the eta and zeta functions for <math>\Re(s)>1</math>.
 
{{hidden begin|titlestyle = background:palegreen;|
title=Direct proof of eta(''s''<sub>''n''</sub>) = 0 by Sondow}}
With some simple algebra performed on finite sums, we can write for any complex ''s''
 
:<math>
\eta_{2n}(s)
    =  \sum_{k=1}^{2n}\frac{(-1)^{k-1}}{k^s}
    =  1-\frac{1}{2^s}+\frac{1}{3^s}-\frac{1}{4^s}+\ldots+\frac{(-1)^{2n-1}}{{(2n)}^s}
 
    =  1+\frac{1}{2^s}+\frac{1}{3^s}+\frac{1}{4^s}+\ldots+\frac{1}{{(2n)}^s}
      - 2(\frac{1}{2^s}+\frac{1}{4^s}+\ldots+\frac{1}{{(2n)}^s})
</math>
 
:<math>
=  (1-\frac{2}{2^s})\zeta_{2n}(s) + \frac{2}{2^s}(\frac{1}{{(n+1)}^s}+\ldots+\frac{1}{{(2n)}^s})
=  (1-\frac{2}{2^s})\zeta_{2n}(s) + \frac{2n}{{(2n)}^s}\,\frac{1}{n}\,(\frac{1}{{(1+1/n)}^s}+
                  \ldots + \frac{1}{{(1+n/n)}^s}).
</math>
 
Now if <math>s=1+it</math> and <math>2^s=2</math>, the factor multiplying <math>\zeta_{2n}(s)\,</math> is zero, and  
 
:<math>
\eta_{2n}(s) = \frac{1}{n^{it}} R_n(\frac{1}{{(1+x)}^s},0,1),
</math>
 
where Rn(''f''(''x''),''a'',''b'') denotes a special Riemann sum approximating the integral of ''f''(''x'') over [''a'',''b''].
For ''t''&nbsp;=&nbsp;0 i.e. ''s''&nbsp;=&nbsp;1, we get
 
:<math>
\eta(1) = \lim_{n\to\infty} \eta_{2n}(1) = \lim_{n\to\infty} R_n(\frac{1}{1+x},0,1) = \int_0^1 \frac{dx}{1+x} = \log 2 \ne 0.
</math>
 
Otherwise, if <math>t\ne0</math>, then <math>|n^{1-s}|=|n^{-it}|=1</math>, which yields
 
:<math>
|\eta(s)| = \lim_{n\to\infty} |\eta_{2n}(s)| = \lim_{n\to\infty} |R_n(\frac{1}{{(1+x)}^s},0,1)|
  =  |\int_0^1 \frac{dx}{{(1+x)}^s}| = |\frac{2^{1-s}-1}{1-s}| = |\frac{1-1}{-it}| = 0.
</math>
{{hidden end}}
 
Assuming <math>\eta(s_n)=0</math>, for each point <math>s_n\ne1</math> where <math>2^{s_n}=2</math>, we can now define <math>\zeta(s_n)\,</math> by continuity as follows,
 
:<math>
\zeta(s_n) = \lim_{s\to s_n}\frac{\eta(s)}{1-\frac{2}{2^s}}
= \lim_{s\to s_n}\frac{\eta(s)-\eta(s_n)}{\frac{2}{2^{s_n}}-\frac{2}{2^s}}
= \lim_{s\to s_n}\frac{\eta(s)-\eta(s_n)}{s-s_n}\,\frac{s-s_n}{\frac{2}{2^{s_n}}-\frac{2}{2^s}}
= \frac{\eta'(s_n)}{\log(2)}.
</math>
 
The apparent singularity of zeta at <math>s_n\ne1</math> is now removed, and the zeta function is proven to  be analytic everywhere in <math>\Re{s} > 0</math>, except at <math>s=1</math> where
 
:<math>
\lim_{s\to1} (s-1)\zeta(s) = \lim_{s\to 1} \frac{\eta(s)}{\frac{1-2^{1-s}}{s-1}}
= \frac{\eta(1)}{\log 2} = 1.
</math>
 
==Integral representations==
A number of integral formulas involving the eta function can be listed. The first one follows from a change of variable of the integral representation of the Gamma function (Abel, 1823), giving a [[Mellin transform]] which can be expressed in different ways as a double integral (Sondow, 2005). This is valid for <math>\Re s > 0.</math>
:<math>
\begin{align}
\Gamma(s)\eta(s) & = \int_0^\infty \frac{x^{s-1}}{e^x+1} \, dx
= \int_0^\infty \int_0^x \frac{x^{s-2}}{e^x+1} \, dy \, dx \\[8pt]
& =\int_0^\infty\int_0^\infty \frac{(t+r)^{s-2}}{e^{t+r}+1}{dr} \, dt
=\int_0^1\int_0^1 \frac{(-\log(x y))^{s-2}}{1 + x y} \, dx \, dy.
\end{align}
</math>
 
The Cauchy–Schlömilch transformation (Amdeberhan, Moll et al., 2010) can be used to prove this other representation, valid for <math>\Re s > -1</math>. Integration by parts of the first integral above in this section yields another derivation.
 
:<math>2^{1-s}\,\Gamma(s+1)\,\eta(s) = 2 \int_0^\infty \frac{x^{2s+1}}{\cosh^2(x^2)} \, dx
= \int_0^\infty \frac{t^s}{\cosh^2(t)} \, dt.
</math>
 
The next formula, due to Lindelöf (1905), is valid over the whole complex plane, when the principal value is taken for the logarithm implicit in the exponential.
:<math>\eta(s) = \int_{-\infty}^\infty \frac{(1/2 + i t)^{-s}}{e^{\pi t}+e^{-\pi t}} \, dt.
</math>
This corresponds to a Jensen (1895) formula for the entire function
<math>(s-1)\,\zeta(s)</math>, valid over the whole complex plane and also proven by Lindelöf.
:<math>(s-1)\zeta(s) = \int_{-\infty}^\infty \frac{(1/2 + i t)^{1-s}}{(e^{\pi t}+e^{-\pi t})^2} \, dt.
</math>
"This formula, remarquable by its simplicity, can be proven easily with the help of Cauchy's theorem, so important for the summation of series" wrote Jensen (1895). Similarly by converting the integration paths to contour integrals one can obtain other formulas for the eta function, such as this generalisation (Milgram, 2012, formula 2.9) stated to be valid for <math>0<c< 1</math> and all <math>s</math> :
:<math>\eta(s) = \frac{1}{2} \int_{-\infty}^\infty \frac{(c + i t)^{-s}}{\sin{(\pi(c+i t))}} \, dt.
</math>
The zeros on the negative real axis are factored out cleanly by making <math>c\to 0^+</math> (Milgram, 2012, formula 3.9) stated to be valid for <math>\Re s < 0</math> :
:<math>\eta(s) = - \sin(s\pi/2) \int_{0}^\infty \frac{t^{-s}}{\sinh{(\pi t)}} \, dt.
</math>
 
==Numerical algorithms==
Most of the [[series acceleration]] techniques developed for [[alternating series]] can be profitably applied to the evaluation of the eta function. One particularly simple, yet reasonable method is to apply [[Euler transform|Euler's transformation of alternating series]], to obtain
 
:<math>\eta(s)=\sum_{n=0}^\infty \frac{1}{2^{n+1}}
\sum_{k=0}^n (-1)^{k} {n \choose k} \frac {1}{(k+1)^s}. </math>
 
Note that the second, inside summation is a [[forward difference]].
 
=== Borwein's method ===
[[Peter Borwein]] used approximations involving [[Chebyshev polynomials]] to produce a method for efficient evaluation of the eta function. If
 
:<math>d_k = n\sum_{i=0}^k \frac{(n+i-1)!4^i}{(n-i)!(2i)!}</math>
 
then
 
:<math>\eta(s) = -\frac{1}{d_n} \sum_{k=0}^{n-1}\frac{(-1)^k(d_k-d_n)}{(k+1)^s}+\gamma_n(s),</math>
 
where for <math>\Re(s) \ge \frac{1}{2} </math> the error term γ<sub>n</sub> is bounded by
 
:<math>|\gamma_n(s)| \le \frac{3}{(3+\sqrt{8})^n} (1+2|\Im(s)|)\exp(\frac{\pi}{2}|\Im(s)|).</math>
 
The factor of <math>3+\sqrt{8}\approx 5.8</math> in the error bound indicates that the Borwein series converges quite rapidly as ''n'' increases.
 
==Particular values==
{{further2|[[Zeta constant]]}}
*η(0) = <sup>1</sup>⁄<sub>2</sub>, the Abel sum of [[Grandi's series]] 1 − 1 + 1 − 1 + · · ·.
*η(−1) = <sup>1</sup>⁄<sub>4</sub>, the Abel sum of [[1 − 2 + 3 − 4 + · · ·]].
*For ''k'' an integer > 1, if ''B''<sub>''k''</sub> is the ''k''-th [[Bernoulli number]] then
*:<math>\eta(1-k) = \frac{2^k-1}{k} B_k.</math>
 
Also:
 
:<math> \!\ \eta(1) = \ln2 </math>, this is the alternating [[harmonic series (mathematics)|harmonic series]]
:<math>\eta(2) = {\pi^2 \over 12} </math> {{OEIS2C|A072691}}
:<math>\eta(4) = {{7\pi^4} \over 720} \approx 0.94703283</math>
:<math>\eta(6) = {{31\pi^6} \over 30240} \approx 0.98555109</math>
:<math>\eta(8) = {{127\pi^8} \over 1209600} \approx 0.99623300</math>
:<math>\eta(10) = {{73\pi^{10}} \over 6842880} \approx 0.99903951</math>
:<math>\eta(12) = {{1414477\pi^{12}} \over {1307674368000}} \approx 0.99975769</math>
 
The general form for even positive integers is:
 
<math>\eta(2n) = (-1)^{n+1}{{B_{2n}\pi^{2n}(2^{2n-1} - 1)} \over {(2n)!}}. </math>
 
==Derivatives==
The derivative with respect to the parameter {{math|s}} is for <math>s\neq 1</math>
:<math>\eta'(s) = \sum_{n=1}^\infty \frac{(-1)^n\ln n}{n^s} = 2^{1-s}\ln 2 \zeta(s)+(1-2^{1-s})\zeta'(s)</math>.
:<math>\eta'(1) = \ln(2)\gamma-\ln(2)^2/2</math>
 
== References ==
* {{cite journal
|last1=Jensen
|first1=J. L. W. V.
|journal=L'intermédiaire des Mathématiciens
|volume=II
|year=1895
|page=346
}}
* {{cite book
|last1=Lindelöf
|first1=Ernst
|title=Le calcul des résidus et ses applications à la théorie des fonctions
|publisher=Gauthier-Villars
|year=1905
|page=103
}}
* {{cite book
|last1=Widder
|first1=David Vernon
|title=The Laplace Transform
|publisher=Princeton University Press
|year=1946
|page=230
}}
* Landau, Edmund, Handbuch der Lehre von der Verteilung der Primzahlen, Erster Band, Berlin, 1909, p.&nbsp;160. (Second edition by Chelsea, New York, 1953, p.&nbsp;160, 933)
* Titchmarsh, E. C. (1986). The Theory of the Riemann Zeta Function, Second revised (Heath-Brown) edition. Oxford University Press.
* {{cite journal
|last1=Conrey
|first1=J. B.
|title=More than two fifths of the zeros of the Riemann zeta function are on the critical line
|journal=Journal für die Reine und Angewandte Mathematik
|volume=399
|year=1989
|pages=1–26
|doi=10.1515/crll.1989.399.1
}}
*{{cite book |last=Knopp |first=Konrad |authorlink=Konrad Knopp |title=Theory and Application of Infinite Series |year=1990 |origyear=1922 |publisher=Dover |isbn=0-486-66165-2}}
* Borwein, P., ''[http://www.cecm.sfu.ca/personal/pborwein/PAPERS/P155.pdf An Efficient Algorithm for the Riemann Zeta Function]'', Constructive experimental and nonlinear analysis, CMS Conference Proc. 27 (2000), 29–34.
* {{cite arxiv
|last1=Sondow
|first1=Jonathan
|eprint=math.CO/0211148
|title= Double integrals for Euler's constant and ln 4/π and an analog of Hadjicostas's formula
|year=2002
}} Amer. Math. Monthly 112 (2005) 61–65, formula 18.
* {{cite arxiv
|last1=Sondow
|first1=Jonathan
|eprint=math/0209393
|title=Zeros of the Alternating Zeta Function on the Line R(s)=1}} Amer. Math. Monthly, 110 (2003) 435–437.
* {{cite web
|first1=Xavier
|last1=Gourdon
|first2=Pascal
|last2=Sebah
|url=http://numbers.computation.free.fr/Constants/Miscellaneous/zetaevaluations.pdf
|title= Numerical evaluation of the Riemann Zeta-function
|year=2003
}}
* {{cite arxiv
|first1=T.
|last1=Amdeberhan
|first2=M. L.
|last2=Glasser
|first3=M. C
|last3=Jones
|first4=V. H.
|last4=Moll
|first5=R.
|last5=Posey
|first6=D.
|last6=Varela
|eprint=1004.2445
|year=2010
|title=The Cauchy–Schlomilch Transformation}} p.&nbsp;12.
* {{cite arxiv
|first1=Michael S.
|last1=Milgram
|eprint=1208.3429
|year=2012
|title=Integral and Series Representations of Riemann’s Zeta Function, Dirichlet’s Eta Function and a Medley of Related Results}}.
 
[[Category:Zeta and L-functions]]

Revision as of 17:03, 3 June 2013

28 year-old Painting Investments Worker Truman from Regina, usually spends time with pastimes for instance interior design, property developers in new launch ec Singapore and writing. Last month just traveled to City of the Renaissance.

Dirichlet eta function η(s) in the complex plane. The color of a point s encodes the value of η(s). Strong colors denote values close to zero and hue encodes the value's argument.

In mathematics, in the area of analytic number theory, the Dirichlet eta function is defined by the following Dirichlet series, which converges for any complex number having real part > 0:

η(s)=n=1(1)n1ns=11s12s+13s14s+

This Dirichlet series is the alternating sum corresponding to the Dirichlet series expansion of the Riemann zeta function, ζ(s) — and for this reason the Dirichlet eta function is also known as the alternating zeta function, also denoted ζ*(s). The following simple relation holds:

η(s)=(121s)ζ(s)

While the Dirichlet series expansion for the eta function is convergent only for any complex number s with real part > 0, it is Abel summable for any complex number. This serves to define the eta function as an entire function (and the above relation then shows the zeta function is meromorphic with a simple pole at s = 1, and perhaps poles at the other zeros of the factor 121s).

Equivalently, we may begin by defining

η(s)=1Γ(s)0xs1ex+1dx

which is also defined in the region of positive real part. This gives the eta function as a Mellin transform.

Hardy gave a simple proof of the functional equation for the eta function, which is

η(s)=212s112sπs1ssin(πs2)Γ(s)η(s+1).

From this, one immediately has the functional equation of the zeta function also, as well as another means to extend the definition of eta to the entire complex plane.

Zeros

The zeros of the eta function include all the zeros of the zeta function: the infinity of negative even integers (real equidistant simple zeros); an infinity of zeros along the critical line, none of which are known to be multiple and over 40% of which have been proven to be simple, and the hypothetical zeros in the critical strip but not on the critical line, which if they do exist must occur at the vertices of rectangles symmetrical around the x-axis and the critical line and whose multiplicity is unknown. In addition, the factor 121s adds an infinity of complex simple zeros, located at equidistant points on the line (s)=1, at sn=1+2nπi/log(2) where n is any nonzero integer.

Under the Riemann hypothesis, the zeros of the eta function would be located symmetrically with respect to the real axis on two parallel lines (s)=1/2,(s)=1, and on the perpendicular half line formed by the negative real axis.

Landau's problem with ζ(s) = η(s)/0 and solutions

In the equation η(s) = (1−21−s) ζ(s), "the pole of ζ(s) at s=1 is cancelled by the zero of the other factor" (Titchmarsh, 1986, p. 17), and as a result η(1) is neither infinite nor zero. However, in the equation

ζ(s)=η(s)121s,

η must be zero at all the points sn=1+n2πln2i,n0,nZ, where the denominator is zero, if the Riemann zeta function is analytic and finite there. The problem of proving this without defining the zeta function first was signaled and left open by E. Landau in his 1909 treatise on number theory: "Whether the eta series is different from zero or not at the points sn1, i.e., whether these are poles of zeta or not, is not readily apparent here."

A first solution for Landau's problem was published almost 40 years later by D. V. Widder in his book The Laplace Transform. It uses the next prime 3 instead of 2 to define a Dirichlet series similar to the eta function, which we will call the λ function, defined for (s)>0 and with some zeros also on (s)=1, but not equal to those of eta. Template:Hidden begin

λ(s)=(133s)ζ(s)=(1+12s)23s+(14s+15s)26s+

If s is real and strictly positive, the series converges since the regrouped terms alternate in sign and decrease in absolute value to zero. According to a theorem on uniform convergence of Dirichlet series first proven by Cahen in 1894, the λ(s) function is then analytic for (s)>0, a region which includes the line Re(s)=1. Now we can define correctly, where the denominators are not zero,

ζ(s)=η(s)122s

or

ζ(s)=λ(s)133s

Since log3log2 is irrational, the denominators in the two definitions are not zero at the same time except for s=1, and the ζ(s) function is thus well defined and analytic for (s)>0 except at s=1. We finally get indirectly that η(sn)=0 when sn1:

η(sn)=(122sn)ζ(sn)=122sn133snλ(sn)=0.

Template:Hidden end

An elementary direct and ζ-independent proof of the vanishing of the eta function at sn1 was published by J. Sondow in 2003. It expresses the value of the eta function as the limit of special Riemann sums associated to an integral known to be zero, using a relation between the partial sums of the Dirichlet series defining the eta and zeta functions for (s)>1.

Template:Hidden begin With some simple algebra performed on finite sums, we can write for any complex s

η2n(s)=k=12n(1)k1ks=112s+13s14s++(1)2n1(2n)s=1+12s+13s+14s++1(2n)s2(12s+14s++1(2n)s)
=(122s)ζ2n(s)+22s(1(n+1)s++1(2n)s)=(122s)ζ2n(s)+2n(2n)s1n(1(1+1/n)s++1(1+n/n)s).

Now if s=1+it and 2s=2, the factor multiplying ζ2n(s) is zero, and

η2n(s)=1nitRn(1(1+x)s,0,1),

where Rn(f(x),a,b) denotes a special Riemann sum approximating the integral of f(x) over [a,b]. For t = 0 i.e. s = 1, we get

η(1)=limnη2n(1)=limnRn(11+x,0,1)=01dx1+x=log20.

Otherwise, if t0, then |n1s|=|nit|=1, which yields

|η(s)|=limn|η2n(s)|=limn|Rn(1(1+x)s,0,1)|=|01dx(1+x)s|=|21s11s|=|11it|=0.

Template:Hidden end

Assuming η(sn)=0, for each point sn1 where 2sn=2, we can now define ζ(sn) by continuity as follows,

ζ(sn)=limssnη(s)122s=limssnη(s)η(sn)22sn22s=limssnη(s)η(sn)ssnssn22sn22s=η(sn)log(2).

The apparent singularity of zeta at sn1 is now removed, and the zeta function is proven to be analytic everywhere in s>0, except at s=1 where

lims1(s1)ζ(s)=lims1η(s)121ss1=η(1)log2=1.

Integral representations

A number of integral formulas involving the eta function can be listed. The first one follows from a change of variable of the integral representation of the Gamma function (Abel, 1823), giving a Mellin transform which can be expressed in different ways as a double integral (Sondow, 2005). This is valid for s>0.

Γ(s)η(s)=0xs1ex+1dx=00xxs2ex+1dydx=00(t+r)s2et+r+1drdt=0101(log(xy))s21+xydxdy.

The Cauchy–Schlömilch transformation (Amdeberhan, Moll et al., 2010) can be used to prove this other representation, valid for s>1. Integration by parts of the first integral above in this section yields another derivation.

21sΓ(s+1)η(s)=20x2s+1cosh2(x2)dx=0tscosh2(t)dt.

The next formula, due to Lindelöf (1905), is valid over the whole complex plane, when the principal value is taken for the logarithm implicit in the exponential.

η(s)=(1/2+it)seπt+eπtdt.

This corresponds to a Jensen (1895) formula for the entire function (s1)ζ(s), valid over the whole complex plane and also proven by Lindelöf.

(s1)ζ(s)=(1/2+it)1s(eπt+eπt)2dt.

"This formula, remarquable by its simplicity, can be proven easily with the help of Cauchy's theorem, so important for the summation of series" wrote Jensen (1895). Similarly by converting the integration paths to contour integrals one can obtain other formulas for the eta function, such as this generalisation (Milgram, 2012, formula 2.9) stated to be valid for 0<c<1 and all s :

η(s)=12(c+it)ssin(π(c+it))dt.

The zeros on the negative real axis are factored out cleanly by making c0+ (Milgram, 2012, formula 3.9) stated to be valid for s<0 :

η(s)=sin(sπ/2)0tssinh(πt)dt.

Numerical algorithms

Most of the series acceleration techniques developed for alternating series can be profitably applied to the evaluation of the eta function. One particularly simple, yet reasonable method is to apply Euler's transformation of alternating series, to obtain

η(s)=n=012n+1k=0n(1)k(nk)1(k+1)s.

Note that the second, inside summation is a forward difference.

Borwein's method

Peter Borwein used approximations involving Chebyshev polynomials to produce a method for efficient evaluation of the eta function. If

dk=ni=0k(n+i1)!4i(ni)!(2i)!

then

η(s)=1dnk=0n1(1)k(dkdn)(k+1)s+γn(s),

where for (s)12 the error term γn is bounded by

|γn(s)|3(3+8)n(1+2|(s)|)exp(π2|(s)|).

The factor of 3+85.8 in the error bound indicates that the Borwein series converges quite rapidly as n increases.

Particular values

Template:Further2

Also:

 η(1)=ln2, this is the alternating harmonic series
η(2)=π212 Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland.
η(4)=7π47200.94703283
η(6)=31π6302400.98555109
η(8)=127π812096000.99623300
η(10)=73π1068428800.99903951
η(12)=1414477π1213076743680000.99975769

The general form for even positive integers is:

η(2n)=(1)n+1B2nπ2n(22n11)(2n)!.

Derivatives

The derivative with respect to the parameter Buying, selling and renting HDB and personal residential properties in Singapore are simple and transparent transactions. Although you are not required to engage a real property salesperson (generally often known as a "public listed property developers In singapore agent") to complete these property transactions, chances are you'll think about partaking one if you are not accustomed to the processes concerned.

Professional agents are readily available once you need to discover an condominium for hire in singapore In some cases, landlords will take into account you more favourably in case your agent comes to them than for those who tried to method them by yourself. You need to be careful, nevertheless, as you resolve in your agent. Ensure that the agent you are contemplating working with is registered with the IEA – Institute of Estate Brokers. Whereas it might sound a hassle to you, will probably be worth it in the end. The IEA works by an ordinary algorithm and regulations, so you'll protect yourself in opposition to probably going with a rogue agent who prices you more than they should for his or her service in finding you an residence for lease in singapore.

There isn't any deal too small. Property agents who are keen to find time for any deal even if the commission is small are the ones you want on your aspect. Additionally they present humbleness and might relate with the typical Singaporean higher. Relentlessly pursuing any deal, calling prospects even without being prompted. Even if they get rejected a hundred times, they still come again for more. These are the property brokers who will find consumers what they need eventually, and who would be the most successful in what they do. 4. Honesty and Integrity

This feature is suitable for you who need to get the tax deductions out of your PIC scheme to your property agency firm. It's endorsed that you visit the correct site for filling this tax return software. This utility must be submitted at the very least yearly to report your whole tax and tax return that you're going to receive in the current accounting 12 months. There may be an official website for this tax filling procedure. Filling this tax return software shouldn't be a tough thing to do for all business homeowners in Singapore.

A wholly owned subsidiary of SLP Worldwide, SLP Realty houses 900 associates to service SLP's fast rising portfolio of residential tasks. Real estate is a human-centric trade. Apart from offering comprehensive coaching applications for our associates, SLP Realty puts equal emphasis on creating human capabilities and creating sturdy teamwork throughout all ranges of our organisational hierarchy. Worldwide Presence At SLP International, our staff of execs is pushed to make sure our shoppers meet their enterprise and investment targets. Under is an inventory of some notable shoppers from completely different industries and markets, who've entrusted their real estate must the expertise of SLP Worldwide.

If you're looking for a real estate or Singapore property agent online, you merely need to belief your instinct. It is because you don't know which agent is sweet and which agent will not be. Carry out research on a number of brokers by looking out the internet. As soon as if you find yourself certain that a selected agent is dependable and trustworthy, you'll be able to choose to utilize his partnerise find you a house in Singapore. More often than not, a property agent is considered to be good if she or he places the contact data on his web site. This is able to imply that the agent does not thoughts you calling them and asking them any questions regarding properties in Singapore. After chatting with them you too can see them of their office after taking an appointment.

Another method by way of which you could find out whether the agent is sweet is by checking the feedback, of the shoppers, on the website. There are various individuals would publish their comments on the web site of the Singapore property agent. You can take a look at these feedback and the see whether it will be clever to hire that specific Singapore property agent. You may even get in contact with the developer immediately. Many Singapore property brokers know the developers and you may confirm the goodwill of the agent by asking the developer. is for s1

η(s)=n=1(1)nlnnns=21sln2ζ(s)+(121s)ζ(s).
η(1)=ln(2)γln(2)2/2

References

  • One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  • Landau, Edmund, Handbuch der Lehre von der Verteilung der Primzahlen, Erster Band, Berlin, 1909, p. 160. (Second edition by Chelsea, New York, 1953, p. 160, 933)
  • Titchmarsh, E. C. (1986). The Theory of the Riemann Zeta Function, Second revised (Heath-Brown) edition. Oxford University Press.
  • One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

    In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

    Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

    Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

    A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

    The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

    There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  • Borwein, P., An Efficient Algorithm for the Riemann Zeta Function, Constructive experimental and nonlinear analysis, CMS Conference Proc. 27 (2000), 29–34.
  • Template:Cite arxiv Amer. Math. Monthly 112 (2005) 61–65, formula 18.
  • Template:Cite arxiv Amer. Math. Monthly, 110 (2003) 435–437.
  • Template:Cite web
  • Template:Cite arxiv p. 12.
  • Template:Cite arxiv.