scholarly journals Ramsey degrees of finite ultrametric spaces, ultrametric Urysohn spaces and dynamics of their isometry groups

2009 ◽  
Vol 30 (4) ◽  
pp. 934-945 ◽  
Author(s):  
Lionel Nguyen Van The
2005 ◽  
Vol 15 (05n06) ◽  
pp. 1013-1024 ◽  
Author(s):  
YAROSLAV LAVRENYUK

Completeness of the group of local isometries of compact ultrametric space is established for transitive group.


2014 ◽  
Vol 26 (6) ◽  
Author(s):  
Maciej Malicki

AbstractThe paper is devoted to a study of isometry groups of Polish ultrametric spaces. We explicitly describe isometry groups of spaces that are non-locally rigid and satisfy the property that distances between orbits under the action of the isometry group are realized by points. The type of group construction appearing here is a variant of the generalized wreath product. We prove that it has a natural universality and uniqueness property. As an application, we characterize Polish ultrametric spaces satisfying the above properties, whose isometry groups have uncountable strong cofinality.


2021 ◽  
Vol 385 ◽  
pp. 107760
Author(s):  
Udayan B. Darji ◽  
Daniel Gonçalves ◽  
Marcelo Sobottka

Entropy ◽  
2021 ◽  
Vol 23 (8) ◽  
pp. 971
Author(s):  
Oded Shor ◽  
Felix Benninger ◽  
Andrei Khrennikov

This paper is devoted to the foundational problems of dendrogramic holographic theory (DH theory). We used the ontic–epistemic (implicate–explicate order) methodology. The epistemic counterpart is based on the representation of data by dendrograms constructed with hierarchic clustering algorithms. The ontic universe is described as a p-adic tree; it is zero-dimensional, totally disconnected, disordered, and bounded (in p-adic ultrametric spaces). Classical–quantum interrelations lose their sharpness; generally, simple dendrograms are “more quantum” than complex ones. We used the CHSH inequality as a measure of quantum-likeness. We demonstrate that it can be violated by classical experimental data represented by dendrograms. The seed of this violation is neither nonlocality nor a rejection of realism, but the nonergodicity of dendrogramic time series. Generally, the violation of ergodicity is one of the basic features of DH theory. The dendrogramic representation leads to the local realistic model that violates the CHSH inequality. We also considered DH theory for Minkowski geometry and monitored the dependence of CHSH violation and nonergodicity on geometry, as well as a Lorentz transformation of data.


2009 ◽  
Vol 2 (4) ◽  
pp. 661-700 ◽  
Author(s):  
Pierre-Emmanuel Caprace ◽  
Nicolas Monod

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