Results 31 to 40 of about 1,082,995 (200)

The space of ultrametric phylogenetic trees

Journal of Theoretical Biology, 2016
Minor changes. This version has been published in JTB.
Gavryushkin, Alex, Drummond, Alexei J.
openaire   +3 more sources

Urysohn ultrametric spaces and isometry groups. [PDF]

, 2009
In this dissertation we study a special sub-collection of Polish metric spaces: complete separable ultrametric spaces. Polish metric spaces have been studied for quite a long while, and a lot of results have been obtained.
Shao, Chuang
core   +1 more source

Computational Models for Ultrametric Spaces

Electronic Notes in Theoretical Computer Science, 1997
AbstractFor every ultrametric space, the set of closed balls of radius 0 or 2-n for some n, form an algebraic poset under reverse inclusion. If the ultrametric space is complete separable, then they form a Scott computational model for it. Conversely, every topological space with an algebraic computational model is a complete separable ultrametrizable ...
Bob Flagg, Ralph Kopperman
openaire   +2 more sources

Isometries of ultrametric normed spaces

, 2021
We show that the group of isometries of an ultrametric normed space can be seen as a kind of a fractal. Then, we apply this description to study ultrametric counterparts of some classical problems in Archimedean analysis, such as the so called Problème ...
Navarro Garmendia, José, Cabello Sánchez, Javier   +1 more
core   +1 more source

On $\ast$-measure monads on the category of ultrametric spaces

Karpatsʹkì Matematičnì Publìkacìï, 2022
The functor of $\ast$-measures of compact support on the category of ultrametric spaces and non-expanding maps is introduced in the previous publication of the authors.
Kh.O. Sukhorukova, M.M. Zarichnyi
doaj   +1 more source

Distance and closeness measures in information spaces [PDF]

, 2006
Obiettivo della tesi è fornire strumenti teorici per il trattamento di informazione “incompleta”. Ciò viene fatto, da un lato, in un ambito metrico, definendo misure di “distanza” tra oggetti, dall’altro definendo nozioni suggerite dalla logica a più ...
Coppola, Cristina
core   +1 more source

Common Fixed Point Theorems of Multivalued Maps in Fuzzy Ultrametric Spaces

Journal of Mathematics, 2013
In the setting of fuzzy ultrametric spaces, we study common fixed point theorems of multivalued maps. Our results unify, extend, and generalize some related common fixed point theorems of the literature for both ultrametric spaces (Wang and Song (2013 ...
A. F. Sayed
doaj   +1 more source

UNIQUE FIXED POINT THEOREMS FOR CONTRACTIVE MAPS TYPE IN T 0 -QUASI-METRIC SPACES [PDF]

, 2014
In [2], Agyingi proved that every generalized contractive mapping defined in a q-spherically complete T 0 -ultra-quasi-metric space has a unique fixed point.
Yae ́ Ulrich Gaba
core   +1 more source

STRUCTURED CONDITION PSEUDOSPECTRA AND STRUCTURED ESSENTIAL CONDITION PSEUDOSPECTRA OF BOUNDED LINEAR OPERATORS ON ULTRAMETRIC BANACH SPACES [PDF]

Journal of Algebraic Systems
In this paper, we introduce and study the structured condition pseudospectra and the structured essential condition pseudospectra of bounded linear operators on ultrametric Banach spaces.
Jawad Ettayb
doaj   +1 more source

Some results on ultrametric 2-normed spaces

Researches in Mathematics
In this paper, we study the ultrametric 2-normed spaces and the ultrametric 2-Banach spaces. In particular, we establish some results on Cauchy sequences in ultrametric 2-normed spaces.
J. Ettayb
doaj   +1 more source