Globalization of the partial isometries of metric spaces and local approximation of the group of isometries of the Urysohn space

Details Globalization of the partial isometries of metric spaces and local approximation of the group of isometries of the Urysohn space Globalization of the partial isometries of metric spaces and local approximation of the group of isometries of the Urysohn space

2008-03-30

arxiv.org/abs/0803.4300v1

Mathematics

Metric Geometry

13 pp,22 Ref

Scientific paper

We prove the equivalence of the two important facts about finite metric spaces and universal Urysohn metric spaces $\Bbb U$, namely theorem A and theorem B below: Theorem A (Approximation): The group of isometry $ISO(\Bbb U)$ contains everywhere dense locally finite subgroup; Theorem G(Globalization): For each finite metric space $F$ there exists another finite metric space $\bar F$ and isometric imbedding $j$ of $F$ to $\bar F$ such that isometry $j$ induces the imbedding of the group monomorphism of the group of isometries of the space $F$ to the group of isometries of space $\bar F$ and each partial isometry of $F$ can be extended up to global isometry in $\bar F$. The fact that theorem $G$, is true was announced in 2005 by author without proof, and was proved by S.Solecki in \cite{Sol} (see also \cite{P,P1}) based on the previous complicate results of other authors. The theorem is generalization of the Hrushevski's theorem about the globalization of the partial isomorphisms of finite graphs. We intend to give a constructive proof in the same spirit for metric spaces elsewhere. We also give the strengthening of homogeneity of Urysohn space and in the last paragraph we gave a short survey of the various constructions of Urysohn space including the new proof of the construction of shift invariant universal distance matrix from \cite{CV}.

Affiliated with

Also associated with

No associations

Rating

Globalization of the partial isometries of metric spaces and local approximation of the group of isometries of the Urysohn space does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Globalization of the partial isometries of metric spaces and local approximation of the group of isometries of the Urysohn space, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Globalization of the partial isometries of metric spaces and local approximation of the group of isometries of the Urysohn space will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-511721