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In general: Boolean semiring, cite Guterman (2008)
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In [[mathematics]], a '''real tree''', or an <math>\mathbb R</math>-'''tree''', is a [[metric space]] (''M'',''d'') such that
for any ''x'', ''y'' in ''M'' there is a unique ''arc'' from ''x'' to ''y'' and this arc is a [[Geodesic#Metric_geometry|geodesic segment]]. Here by an ''arc'' from ''x'' to ''y'' we mean the image in ''M'' of a [[homeomorphism|topological embedding]] ''f'' from an [[Interval (mathematics)|interval]] [''a'',''b''] to ''M'' such that ''f''(''a'')=''x'' and ''f''(''b'')=''y''. The condition that the arc is a geodesic segment means that the map ''f'' above can be chosen to be an [[isometry|isometric]] [[embedding]], that is it can be chosen so that for every ''z, t'' in [''a'',''b''] we have ''d(f(z), f(t))''=|''z-t''| and that ''f(a)=x'', ''f(b)=y''.
 
Equivalently, a [[geodesic metric space]] ''M'' is a real tree if and only if ''M'' is a [[δ-hyperbolic space]] with δ=0.
   
Complete real trees are [[injective metric space]]s {{harv|Kirk|1998}}.
 
There is a theory of [[group action]]s on '''R'''-trees, known as the [[Rips machine]],  which is part of [[geometric group theory]].
 
== Simplicial R-trees ==
A '''simplicial''' '''R'''-tree is an '''R'''-tree that is free from certain "topological strangeness".  More precisely, a point ''x'' in an '''R'''-tree ''T'' is called '''ordinary''' if ''T''&minus;''x'' has exactly two components. The points which are not ordinary are '''singular'''.  We define a simplicial '''R'''-tree to be an '''R'''-tree whose set of singular points is [[Discrete space|discrete]] and [[Closed set|closed]].
 
== Examples ==
* Each discrete [[Tree (graph theory)|tree]] can be regarded as an '''R'''-tree by a simple construction such that neighboring vertices have distance one.
* The [[Paris metric]] makes the plane into an '''R'''-tree. If two points are on the same ray in the plane, their distance is defined as the [[Euclidean distance]]. Otherwise, their distance is defined to be the sum of the Euclidian distances of these two points to the origin. More generally any [[hedgehog space]] is an example of a real tree.
* The '''R'''-tree obtained in the following way is nonsimplicial. Start with the interval [0,2] and [[Quotient space#Examples|glue]], for each positive integer ''n'', an interval of length 1/''n'' to the point 1&minus;1/''n'' in the original interval.  The set of singular points is discrete, but fails to be closed since 1 is an ordinary point in this '''R'''-tree.  Gluing an interval to 1 would result in a [[closed set]] of singular points at the expense of discreteness.
 
==See also==
*[[Dendroid (topology)]]
*[[Tree-graded space]]
 
== References ==
 
*{{citation
| last = Bestvina | first = Mladen | authorlink = Mladen Bestvina
| contribution = ℝ-trees in topology, geometry, and group theory
| location = Amsterdam
| mr = 1886668
| pages = 55–91
| publisher = North-Holland
| title = Handbook of geometric topology
| url = http://www.math.utah.edu/~bestvina/eprints/handbook.ps
| year = 2002}}.
*{{citation
| last = Chiswell | first = Ian
| isbn = 981-02-4386-3
| location = River Edge, NJ
| mr = 1851337
| publisher = World Scientific Publishing Co. Inc.
| title = Introduction to Λ-trees
| year = 2001}}.
*{{citation
| last = Kirk | first = W. A.
| issue = 1
| journal = Fundamenta Mathematicae
| mr = 1610559
| pages = 67–72
| title = Hyperconvexity of '''R'''-trees
| volume = 156
| url = http://matwbn.icm.edu.pl/ksiazki/fm/fm156/fm15613.pdf
| year = 1998}}.
*{{citation
| last = Shalen | first = Peter B.
| editor-last = Gersten | editor-first = S. M.
| contribution = Dendrology of groups: an introduction
| isbn = 978-0-387-96618-2
| mr = 919830
| pages = 265–319
| publisher = [[Springer-Verlag]]
| series = Math. Sci. Res. Inst. Publ.
| title = Essays in group theory
| volume = 8
| year = 1987}}.
 
[[Category:Group theory]]
[[Category:Geometry]]
[[Category:Topology]]
[[Category:Trees (topology)]]

Revision as of 22:32, 1 February 2014

In mathematics, a real tree, or an -tree, is a metric space (M,d) such that for any x, y in M there is a unique arc from x to y and this arc is a geodesic segment. Here by an arc from x to y we mean the image in M of a topological embedding f from an interval [a,b] to M such that f(a)=x and f(b)=y. The condition that the arc is a geodesic segment means that the map f above can be chosen to be an isometric embedding, that is it can be chosen so that for every z, t in [a,b] we have d(f(z), f(t))=|z-t| and that f(a)=x, f(b)=y.

Equivalently, a geodesic metric space M is a real tree if and only if M is a δ-hyperbolic space with δ=0.

Complete real trees are injective metric spaces Template:Harv.

There is a theory of group actions on R-trees, known as the Rips machine, which is part of geometric group theory.

Simplicial R-trees

A simplicial R-tree is an R-tree that is free from certain "topological strangeness". More precisely, a point x in an R-tree T is called ordinary if Tx has exactly two components. The points which are not ordinary are singular. We define a simplicial R-tree to be an R-tree whose set of singular points is discrete and closed.

Examples

  • Each discrete tree can be regarded as an R-tree by a simple construction such that neighboring vertices have distance one.
  • The Paris metric makes the plane into an R-tree. If two points are on the same ray in the plane, their distance is defined as the Euclidean distance. Otherwise, their distance is defined to be the sum of the Euclidian distances of these two points to the origin. More generally any hedgehog space is an example of a real tree.
  • The R-tree obtained in the following way is nonsimplicial. Start with the interval [0,2] and glue, for each positive integer n, an interval of length 1/n to the point 1−1/n in the original interval. The set of singular points is discrete, but fails to be closed since 1 is an ordinary point in this R-tree. Gluing an interval to 1 would result in a closed set of singular points at the expense of discreteness.

See also

References

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  • Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.

    Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.

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    Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.

    15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.

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  • Many property agents need to declare for the PIC grant in Singapore. However, not all of them know find out how to do the correct process for getting this PIC scheme from the IRAS. There are a number of steps that you need to do before your software can be approved.

    Naturally, you will have to pay a safety deposit and that is usually one month rent for annually of the settlement. That is the place your good religion deposit will likely be taken into account and will kind part or all of your security deposit. Anticipate to have a proportionate amount deducted out of your deposit if something is discovered to be damaged if you move out. It's best to you'll want to test the inventory drawn up by the owner, which can detail all objects in the property and their condition. If you happen to fail to notice any harm not already mentioned within the inventory before transferring in, you danger having to pay for it yourself.

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    Once you place down the one per cent choice price to carry down a non-public property, it's important to accept its situation as it is whenever you move in – faulty air-con, choked rest room and all. Get round this by asking your agent to incorporate a ultimate inspection clause within the possibility-to-buy letter. HDB flat patrons routinely take pleasure in this security net. "There's a ultimate inspection of the property two days before the completion of all HDB transactions. If the air-con is defective, you can request the seller to repair it," says Kelvin.

    15.6.1 As the agent is an intermediary, generally, as soon as the principal and third party are introduced right into a contractual relationship, the agent drops out of the image, subject to any problems with remuneration or indemnification that he could have against the principal, and extra exceptionally, against the third occasion. Generally, agents are entitled to be indemnified for all liabilities reasonably incurred within the execution of the brokers´ authority.

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