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| In [[linear algebra]], a [[square matrix]] ''A'' is called '''diagonalizable''' if it is [[similar (linear algebra)|similar]] to a [[diagonal matrix]], i.e., if there exists an [[invertible matrix]] ''P'' such that ''P''<sup>−1</sup>''AP'' is a diagonal matrix. If ''V'' is a finite-[[dimension (linear algebra)|dimension]]al [[vector space]], then a [[linear operator|linear map]] ''T'' : ''V'' → ''V'' is called '''diagonalizable''' if there exists an [[Basis (linear algebra)#Ordered bases and coordinates|ordered basis]] of ''V'' with respect to which ''T'' is represented by a diagonal matrix. '''Diagonalization''' is the process of finding a corresponding [[diagonal matrix]] for a diagonalizable matrix or linear map.<ref>Horn & Johnson 1985</ref> A square matrix which is not diagonalizable is called ''[[Defective matrix|defective]].''
| | During 2012 particularly, there has been a flurry of media interest in the so-called 'miracle' fat loss product - green coffee bean extract. In fact fat reduction utilizing green coffee extract is the most searched issue by people researching how they can best lose weight safely plus effectively.<br><br>The fat reduction mechanisms of [http://greencoffeeweightlossplan.com green coffee weight loss] Extract have been attributed to its effects on Glycemic Control, as opposed to a speeded-up metabolism caused by caffeine. Researchers have focused on all of the active components: Chlorogenic Acid, Quinides, Lignans, plus Trigonelline, all of that have been proven to enhance glucose metabolism.<br><br>Chlorogenic acid plays an important part in your metabolism. It slows down the release of glucose after a meal. This stops fat from being yielded which assists with a weight loss efforts. It boosts your metabolism plus enables you to achieve higher rates of burned up calories. Higher the amount of calories burned, higher is the weight reduction.<br><br>Most of the doctors plus analysis specialists are thinking how can a coffee is made to reduce the excess weight! They were under shock whenever it was experimentally proved. Folks will consume this product and utilize inside their daily because a dietary supplement.<br><br>Ads plus claims are often supported by testimonials by, stories about, and pictures of people who have successfully lost fat with the certain weight reduction product.<br><br>Hopefully can today see why chlorogenic acid could enable us loose weight. Firstly, when you eat some before a meal, we'll absorb less glucose inside the small intestine. This will lower the blood glucose, thus our body might wish To compensate by breaking down glycogen inside the liver to release more glucose. However you can't do this effectively because G6P has been inhibited. This means our body requirements to go find another gas source. Yep, you've guessed it - it has to burn more fat!<br><br>Whenever coffee beans are roasted, almost all of the chlorogenicacid is lost. Green Coffee Beans, in contrast, are un-roasted, have little aroma, are bitter, and contain over 50% Chlorogenic Acid.<br><br>When you wish To get that body which you desire, you have to make a choice about the coffee which you like to drink daily. Green coffee bean Walgreens is great for you and we will love the different advantages which this will offer you. If you take this and also get an active and healthy lifestyle, you are able to receive the body which we have been dreaming of. It is not difficult to look for this form of coffee because you are able to merely buy this at Walgreens. The product is getting more popular now plus for this reason, you are able to easily shop for the green coffee bean extract walmart online. |
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| Diagonalizable matrices and maps are of interest because diagonal matrices are especially easy to handle: [[Transformation_matrix#Eigenbasis_and_diagonal_matrix|their eigenvalues and eigenvectors are known]] and one can raise a diagonal matrix to a power by simply raising the diagonal entries to that same power. Geometrically, a diagonalizable matrix is an '''[[inhomogeneous dilation]]''' (or ''anisotropic scaling'') — it [[Scaling (geometry)|scales]] the space, as does a ''[[homogeneous dilation]]'', but by a different factor in each direction, determined by the scale factors on each axis (diagonal entries).
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| == Characterization ==
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| The fundamental fact about diagonalizable maps and matrices is expressed by the following:
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| * An ''n''×''n'' matrix ''A'' over the [[field (mathematics)|field]] ''F'' is diagonalizable [[if and only if]] the sum of the [[dimension (linear algebra)|dimension]]s of its eigenspaces is equal to ''n'', which is the case if and only if there exists a [[basis (linear algebra)|basis]] of ''F''<sup>''n''</sup> consisting of eigenvectors of ''A''. If such a basis has been found, one can form the matrix ''P'' having these basis vectors as columns, and ''P''<sup>−1</sup>''AP'' will be a diagonal matrix. The diagonal entries of this matrix are the eigenvalues of ''A''.
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| * A linear map ''T'' : ''V'' → ''V'' is diagonalizable if and only if the sum of the [[dimension (linear algebra)|dimension]]s of its eigenspaces is equal to dim(''V''), which is the case if and only if there exists a basis of ''V'' consisting of eigenvectors of ''T''. With respect to such a basis, ''T'' will be represented by a diagonal matrix. The diagonal entries of this matrix are the eigenvalues of ''T''.
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| Another characterization: A matrix or linear map is diagonalizable over the field ''F'' if and only if its [[minimal polynomial (linear algebra)|minimal polynomial]] is a product of distinct linear factors over ''F''. (Put in another way, a matrix is diagonalizable if and only if all of its [[elementary divisor]]s are linear.)
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| The following sufficient (but not necessary) condition is often useful.
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| * An ''n''×''n'' matrix ''A'' is diagonalizable over the field ''F'' if it has ''n'' distinct eigenvalues in ''F'', i.e. if its [[characteristic polynomial]] has ''n'' distinct roots in ''F''; however, the converse may be false. Let us consider
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| :: <math>\begin{bmatrix} -1 & 3 & -1 \\ -3 & 5 & -1 \\ -3 & 3 & 1 \end{bmatrix},</math>
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| : which has eigenvalues 1, 2, 2 (not all distinct) and is diagonalizable with diagonal form ( [[similar (linear algebra)|similar]] to ''A'')
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| :: <math>\begin{bmatrix} 1 & 0 & 0 \\ 0 & 2 & 0 \\ 0 & 0 & 2 \end{bmatrix}</math>
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| : and [[change of basis|change of basis matrix]] ''P''
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| :: <math>\begin{bmatrix} 1 & 1 & -1 \\ 1 & 1 & 0 \\ 1 & 0 & 3 \end{bmatrix}.</math>
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| : The converse fails when ''A'' has an eigenspace of dimension higher than 1. In this example, the eigenspace of ''A'' associated with the eigenvalue 2 has dimension 2.
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| * A linear map ''T'' : ''V'' → ''V'' with ''n'' = dim(''V'') is diagonalizable if it has ''n'' distinct eigenvalues, i.e. if its characteristic polynomial has ''n'' distinct roots in ''F''.
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| Let ''A'' be a matrix over ''F''. If ''A'' is diagonalizable, then so is any power of it. Conversely, if ''A'' is invertible, ''F'' is algebraically closed, and ''A<sup>n</sup>'' is diagonalizable for some ''n'' that is not an integer multiple of the characteristic of ''F'', then ''A'' is diagonalizable. Proof: If ''A<sup>n</sup>'' is diagonalizable, then ''A'' is annihilated by some polynomial <math>(x^n - \lambda_1) \cdots (x^n - \lambda_k)</math>, which has no multiple root (since <math>\lambda_j \ne 0</math>) and is divided by the minimal polynomial of ''A''.
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| As a rule of thumb, over '''C''' almost every matrix is diagonalizable. More precisely: the set of complex ''n''×''n'' matrices that are ''not'' diagonalizable over '''C''', considered as a [[subset]] of '''C'''<sup>''n''×''n''</sup>, has [[Lebesgue measure]] zero. One can also say that the diagonalizable matrices form a dense subset with respect to the [[Zariski topology]]: the complement lies inside the set where the [[discriminant]] of the characteristic polynomial vanishes, which is a [[hypersurface]]. From that follows also density in the usual (''strong'') topology given by a [[norm (mathematics)|norm]]. The same is not true over '''R'''.
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| The [[Jordan–Chevalley decomposition]] expresses an operator as the sum of its semisimple (i.e., diagonalizable) part and its [[nilpotent]] part. Hence, a matrix is diagonalizable if and only if its nilpotent part is zero. Put in another way, a matrix is diagonalizable if each block in its [[Jordan form]] has no nilpotent part; i.e., each "block" is a one-by-one matrix.
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| == Diagonalization ==
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| If a matrix ''A'' can be diagonalized, that is,
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| :<math>P^{-1}AP=\begin{pmatrix}\lambda_{1}\\
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| & \lambda_{2}\\
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| & & \ddots\\
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| & & & \lambda_{n}\end{pmatrix},</math>
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| then:
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| :<math>AP=P\begin{pmatrix}\lambda_{1}\\
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| & \lambda_{2}\\
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| & & \ddots\\
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| & & & \lambda_{n}\end{pmatrix} .</math>
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| Writing ''P'' as a [[block matrix]] of its column vectors <math>\vec{\alpha}_{i}</math>
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| :<math>P=\begin{pmatrix}\vec{\alpha}_{1} & \vec{\alpha}_{2} & \cdots & \vec{\alpha}_{n}\end{pmatrix},</math>
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| the above equation can be rewritten as
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| :<math>A\vec{\alpha}_{i}=\lambda_{i}\vec{\alpha}_{i}\qquad(i=1,2,\cdots,n).</math>
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| So the column vectors of ''P'' are [[right eigenvector]]s of ''A'', and the corresponding diagonal entry is the corresponding [[eigenvalue]]. The invertibility of ''P'' also suggests that the eigenvectors are [[linearly independent]] and form a basis of ''F''<sup>''n''</sup>. This is the necessary and sufficient condition for diagonalizability and the canonical approach of diagonalization. The row vectors of ''P''<sup>−1</sup> are the [[left eigenvector]]s of ''A''.
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| When the matrix ''A'' is a [[Hermitian matrix]] (resp. [[symmetric matrix]]), eigenvectors of ''A'' can be chosen to form an [[orthonormal basis]] of '''C'''<sup>''n''</sup> (resp. '''R'''<sup>''n''</sup>). Under such circumstance ''P'' will be a [[unitary matrix]] (resp. [[orthogonal matrix]]) and ''P''<sup>−1</sup> equals the [[conjugate transpose]] (resp. [[transpose]]) of ''P''.
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| == Simultaneous diagonalization ==
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| {{See also|Triangular matrix#Simultaneous triangularisability|l1=Simultaneous triangularisability|Weight (representation theory)|Positive definite matrix#Simultaneous_diagonalization|l3=Positive definite matrix}}
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| A set of matrices are said to be ''simultaneously diagonalisable'' if there exists a single invertible matrix ''P'' such that ''P''<sup>−1</sup>''AP'' is a diagonal matrix for every ''A'' in the set. The following theorem characterises simultaneously diagonalisable matrices: A set of diagonalizable [[Commuting matrices|matrices commutes]] if and only if the set is simultaneously diagonalisable.<ref>Horn & Johnson 1985, pp. 51–53</ref>
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| The set of all ''n''×''n'' diagonalisable matrices (over '''C''') with ''n'' > 1 is not simultaneously diagonalisable. For instance, the matrices
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| :<math> \begin{bmatrix} 1 & 0 \\ 0 & 0 \end{bmatrix} \quad\text{and}\quad \begin{bmatrix} 1 & 1 \\ 0 & 0 \end{bmatrix} </math>
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| are diagonalizable but not simultaneously diagonalizable because they do not commute. | |
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| A set consists of commuting [[normal matrix|normal matrices]] if and only if it is simultaneously diagonalisable by a [[unitary matrix]]; that is, there exists a unitary matrix ''U'' such that ''U*AU'' is diagonal for every ''A'' in the set.
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| In the language of [[Lie theory]], a set of simultaneously diagonalisable matrices generate a [[toral Lie algebra]].
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| == Examples ==
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| === Diagonalizable matrices ===
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| * [[Involution (mathematics)|Involution]]s are diagonalisable over the reals (and indeed any field of characteristic not 2), with ±1 on the diagonal
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| * Finite order [[endomorphism]]s are diagonalisable over '''C''' (or any algebraically closed field where the characteristic of the field does not divide the order of the endomorphism) with [[roots of unity]] on the diagonal. This follows since the minimal polynomial is [[separable polynomial|separable]], because the roots of unity are distinct.
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| * [[Projection (linear algebra)|Projections]] are diagonalizable, with 0's and 1's on the diagonal.
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| * Real [[symmetric matrices]] are diagonalizable by [[orthogonal matrix|orthogonal matrices]]; i.e., given a real symmetric matrix ''A'', ''Q<sup>T</sup>AQ'' is diagonal for some orthogonal matrix ''Q''. More generally, matrices are diagonalizable by [[unitary matrix|unitary matrices]] if and only if they are [[normal matrix|normal]]. In the case of the real symmetric matrix, we see that <math>A=A^T</math>, so clearly <math>AA^T=A^TA</math> holds. Examples of normal matrices are real symmetric (or skew-symmetric) matrices (e.g. covariance matrices) and [[Hermitian matrix|Hermitian matrices]] (or skew-Hermitian matrices). See [[spectral theorem]]s for generalizations to infinite-dimensional vector spaces.
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| === Matrices that are not diagonalizable ===
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| In general, a [[rotation matrix]] is not diagonalizable over the reals, but all [[rotation matrix#Independent planes|rotation matrices]] are diagonalizable over the complex field. Even if a matrix is not diagonalizable, it is always possible to "do the best one can", and find a matrix with the same properties consisting of eigenvalues on the leading diagonal, and either ones or zeroes on the superdiagonal - known as [[Jordan Normal Form|Jordan normal form]].
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| Some matrices are not diagonalizable over any field, most notably nonzero [[nilpotent matrix|nilpotent matrices]]. This happens more generally if the [[Eigenvalue,_eigenvector_and_eigenspace#Algebraic and geometric multiplicities|algebraic and geometric multiplicities]] of an eigenvalue do not coincide. For instance, consider
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| :<math> C = \begin{bmatrix} 0 & 1 \\ 0 & 0 \end{bmatrix}. </math>
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| This matrix is not diagonalizable: there is no matrix ''U'' such that ''U''<sup>−1</sup>''CU'' is a diagonal matrix. Indeed, ''C'' has one eigenvalue (namely zero) and this eigenvalue has algebraic multiplicity 2 and geometric multiplicity 1.
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| Some real matrices are not diagonalizable over the reals. Consider for instance the matrix
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| :<math> B = \begin{bmatrix} 0 & 1 \\ -1 & 0 \end{bmatrix}. </math>
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| The matrix ''B'' does not have any real eigenvalues, so there is no '''real''' matrix ''Q'' such that ''Q''<sup>−1</sup>''BQ'' is a diagonal matrix. However, we can diagonalize ''B'' if we allow complex numbers. Indeed, if we take
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| :<math> Q = \begin{bmatrix} 1 & \textrm{i} \\ \textrm{i} & 1 \end{bmatrix}, </math>
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| then ''Q''<sup>−1</sup>''BQ'' is diagonal.
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| Note that the above examples show that the sum of diagonalizable matrices need not be diagonalizable.
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| === How to diagonalize a matrix ===
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| Consider a matrix
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| :<math>A=\begin{bmatrix}
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| 1& 2 & 0 \\
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| 0 & 3 & 0 \\
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| 2 & -4 & 2 \end{bmatrix}.</math>
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| This matrix has [[eigenvalues]]
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| : <math> \lambda_1 = 3, \quad \lambda_2 = 2, \quad \lambda_3= 1. </math>
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| ''A'' is a 3×3 matrix with 3 different eigenvalues; therefore, it is diagonalizable. Note that if there are exactly ''n'' distinct eigenvalues in an ''n''×''n'' matrix then this matrix is diagonalizable.
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| These eigenvalues are the values that will appear in the diagonalized form of matrix ''A'', so by finding the eigenvalues of ''A'' we have diagonalized it. We could stop here, but it is a good check to use the [[eigenvectors]] to diagonalize ''A''.
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| The [[eigenvectors]] of ''A'' are
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| :<math>v_1 = \begin{bmatrix} -1 \\ -1 \\ 2 \end{bmatrix}, \quad v_2 = \begin{bmatrix} 0 \\ 0 \\ 1 \end{bmatrix}, \quad v_3 = \begin{bmatrix} -1 \\ 0 \\ 2 \end{bmatrix}.</math>
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| One can easily check that <math>A v_k = \lambda_k v_k.</math>
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| Now, let ''P'' be the matrix with these eigenvectors as its columns:
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| :<math>P= \begin{bmatrix}
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| -1 & 0 & -1 \\
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| -1 & 0 & 0 \\
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| 2 & 1 & 2 \end{bmatrix}.</math>
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| Note there is no preferred order of the eigenvectors in ''P''; changing the order of the [[eigenvectors]] in ''P'' just changes the order of the [[eigenvalues]] in the diagonalized form of ''A''.<ref>{{cite book| last1=Anton |first1=H. |last2= Rorres|first2= C. |title=Elementary Linear Algebra (Applications Version) |publisher=John Wiley & Sons|edition=8th|date=22 Feb 2000| ISBN= 978-0-471-17052-5}}</ref>
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| Then ''P'' diagonalizes ''A'', as a simple computation confirms, having calculated ''P''<sup> −1</sup> using any [[Invertible_matrix#Methods_of_matrix_inversion|suitable method]]:
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| :<math>P^{-1}AP =
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| \begin{bmatrix}
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| 0 & -1 & 0 \\
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| 2 & 0 & 1 \\
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| -1 & 1 & 0 \end{bmatrix}
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| \begin{bmatrix}
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| 1 & 2 & 0 \\
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| 0 & 3 & 0 \\
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| 2 & -4 & 2 \end{bmatrix}
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| \begin{bmatrix}
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| -1 & 0 & -1 \\
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| -1 & 0 & 0 \\
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| 2 & 1 & 2 \end{bmatrix} =
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| \begin{bmatrix}
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| 3 & 0 & 0 \\
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| 0 & 2 & 0 \\
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| 0 & 0 & 1\end{bmatrix}.</math>
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| Note that the eigenvalues <math>\lambda_k</math> appear in the diagonal matrix.
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| == An application ==
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| Diagonalization can be used to compute the powers of a matrix ''A'' efficiently, provided the matrix is diagonalizable. Suppose we have found that
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| :<math>P^{-1}AP = D</math>
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| is a diagonal matrix. Then, as the matrix product is associative,
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| :<math>\begin{align}
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| A^k &= (PDP^{-1})^k = (PDP^{-1}) \cdot (PDP^{-1}) \cdots (PDP^{-1}) \\
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| &= PD(P^{-1}P) D (P^{-1}P) \cdots (P^{-1}P) D P^{-1} \\
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| &= PD^kP^{-1} \end{align} </math>
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| and the latter is easy to calculate since it only involves the powers of a diagonal matrix. This approach can be generalized to [[matrix exponential]] and other [[matrix function]]s since they can be defined as power series.
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| This is particularly useful in finding closed form expressions for terms of [[linear recursive sequences]], such as the [[Fibonacci number]]s.
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| === Particular application ===
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| For example, consider the following matrix:
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| :<math>M =\begin{bmatrix}a & b-a \\ 0 &b \end{bmatrix}.</math>
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| Calculating the various powers of ''M'' reveals a surprising pattern:
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| :<math>M^2 = \begin{bmatrix}a^2 & b^2-a^2 \\ 0 &b^2 \end{bmatrix},\quad
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| M^3 = \begin{bmatrix}a^3 & b^3-a^3 \\ 0 &b^3 \end{bmatrix},\quad
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| M^4 = \begin{bmatrix}a^4 & b^4-a^4 \\ 0 &b^4 \end{bmatrix},\quad \ldots</math>
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| The above phenomenon can be explained by diagonalizing ''M''. To accomplish this, we need a basis of '''R'''<sup>2</sup> consisting of eigenvectors of ''M''. One such eigenvector basis is given by
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| :<math>\mathbf{u}=\begin{bmatrix} 1 \\ 0 \end{bmatrix}=\mathbf{e}_1,\quad \mathbf{v}=\begin{bmatrix} 1 \\ 1 \end{bmatrix}=\mathbf{e}_1+\mathbf{e}_2,</math>
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| where '''e'''<sub>i</sub> denotes the standard basis of '''R'''<sup>n</sup>. The reverse change of basis is given by
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| :<math> \mathbf{e}_1 = \mathbf{u},\qquad \mathbf{e}_2 = \mathbf{v}-\mathbf{u}.</math>
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| Straightforward calculations show that
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| :<math>M\mathbf{u} = a\mathbf{u},\qquad M\mathbf{v}=b\mathbf{v}.</math>
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| Thus, ''a'' and ''b'' are the eigenvalues corresponding to '''u''' and '''v''', respectively. By linearity of matrix multiplication, we have that
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| :<math> M^n \mathbf{u} = a^n\, \mathbf{u},\qquad M^n \mathbf{v}=b^n\,\mathbf{v}.</math>
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| Switching back to the standard basis, we have
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| :<math> M^n \mathbf{e}_1 = M^n \mathbf{u} = a^n \mathbf{e}_1,</math>
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| :<math> M^n \mathbf{e}_2 = M^n (\mathbf{v}-\mathbf{u}) = b^n \mathbf{v} - a^n\mathbf{u} = (b^n-a^n) \mathbf{e}_1+b^n\mathbf{e}_2.</math>
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| The preceding relations, expressed in matrix form, are
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| :<math> M^n = \begin{bmatrix}a^n & b^n-a^n \\ 0 &b^n \end{bmatrix}, </math>
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| thereby explaining the above phenomenon.
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| == Quantum mechanical application ==
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| In [[quantum mechanics|quantum mechanical]] and [[quantum chemistry|quantum chemical]] computations matrix diagonalization is one of the most frequently applied numerical processes. The basic reason is that the time-independent [[Schrödinger equation]] is an eigenvalue equation, albeit in most of the physical situations on an infinite dimensional space (a [[Hilbert space]]). A very common approximation is to truncate Hilbert space to finite dimension, after which the Schrödinger equation can be formulated as an eigenvalue problem of a real symmetric, or complex Hermitian, matrix. Formally this approximation is founded on the [[variational principle]], valid for Hamiltonians that are bounded from below.
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| But also first-order perturbation theory for degenerate states leads to a matrix eigenvalue problem.
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| == See also ==
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| * [[Defective matrix]]
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| * [[Scaling (geometry)]]
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| * [[Triangular matrix]]
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| * [[Semisimple operator]]
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| * [[Diagonalizable group]]
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| * [[Jordan normal form]]
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| * [[Weight module]] – associative algebra generalization
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| == Notes ==
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| {{Reflist}}
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| == References ==
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| * {{cite book | last1=Horn | first1=Roger A. | last2=Johnson | first2=Charles R. | title=Matrix Analysis | publisher= Cambridge University Press | isbn=978-0-521-38632-6 | year=1985}}
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| == External links ==
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| * {{planetmath reference|id=1960|title=Diagonalization}}
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| [[Category:Matrices]]
| |
During 2012 particularly, there has been a flurry of media interest in the so-called 'miracle' fat loss product - green coffee bean extract. In fact fat reduction utilizing green coffee extract is the most searched issue by people researching how they can best lose weight safely plus effectively.
The fat reduction mechanisms of green coffee weight loss Extract have been attributed to its effects on Glycemic Control, as opposed to a speeded-up metabolism caused by caffeine. Researchers have focused on all of the active components: Chlorogenic Acid, Quinides, Lignans, plus Trigonelline, all of that have been proven to enhance glucose metabolism.
Chlorogenic acid plays an important part in your metabolism. It slows down the release of glucose after a meal. This stops fat from being yielded which assists with a weight loss efforts. It boosts your metabolism plus enables you to achieve higher rates of burned up calories. Higher the amount of calories burned, higher is the weight reduction.
Most of the doctors plus analysis specialists are thinking how can a coffee is made to reduce the excess weight! They were under shock whenever it was experimentally proved. Folks will consume this product and utilize inside their daily because a dietary supplement.
Ads plus claims are often supported by testimonials by, stories about, and pictures of people who have successfully lost fat with the certain weight reduction product.
Hopefully can today see why chlorogenic acid could enable us loose weight. Firstly, when you eat some before a meal, we'll absorb less glucose inside the small intestine. This will lower the blood glucose, thus our body might wish To compensate by breaking down glycogen inside the liver to release more glucose. However you can't do this effectively because G6P has been inhibited. This means our body requirements to go find another gas source. Yep, you've guessed it - it has to burn more fat!
Whenever coffee beans are roasted, almost all of the chlorogenicacid is lost. Green Coffee Beans, in contrast, are un-roasted, have little aroma, are bitter, and contain over 50% Chlorogenic Acid.
When you wish To get that body which you desire, you have to make a choice about the coffee which you like to drink daily. Green coffee bean Walgreens is great for you and we will love the different advantages which this will offer you. If you take this and also get an active and healthy lifestyle, you are able to receive the body which we have been dreaming of. It is not difficult to look for this form of coffee because you are able to merely buy this at Walgreens. The product is getting more popular now plus for this reason, you are able to easily shop for the green coffee bean extract walmart online.