Zobrazeno 1 - 10
of 68
pro vyhledávání: '"Wiesław Kubiś"'
Publikováno v:
Forum of Mathematics, Sigma, Vol 12 (2024)
We extend the Kechris–Pestov–Todorčević correspondence to weak Fraïssé categories and automorphism groups of generic objects. The new ingredient is the weak Ramsey property. We demonstrate the theory on several examples including monoid categ
Externí odkaz:
https://doaj.org/article/c1b1cc86e166447f86fc275a332c4a48
Autor:
Wiesław Kubiś, Paul Szeptycki
Publikováno v:
Canadian Mathematical Bulletin. 66:156-165
We introduce natural strengthenings of sequential compactness called the $r$-Ramsey property for each natural number $r\geq 1$. We prove that metrizable compact spaces are $r$-Ramsey for all $r$ and give examples of compact spaces that are $r$-Ramsey
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4bdb225e72e64797771eaf49232b7332
https://doi.org/10.4153/s0008439522000170
https://doi.org/10.4153/s0008439522000170
Publikováno v:
Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A. Matemáticas. 117
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d901c17aa53a01e91e36b9c470571ac6
https://doi.org/10.1007/s13398-022-01331-4
https://doi.org/10.1007/s13398-022-01331-4
Autor:
Wiesław Kubiś, Saharon Shelah
Publikováno v:
The Journal of Symbolic Logic. 85:817-827
We present three examples of countable homogeneous structures (also called Fraisse limits) whose automorphism groups are not universal, namely, fail to contain isomorphic copies of all automorphism groups of their substructures. Our first example is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eba03e85df8d2423e1658f5e0888322d
https://doi.org/10.1017/jsl.2020.10
https://doi.org/10.1017/jsl.2020.10
We study the question which Boolean algebras have the property that for every generating set there is an ultrafilter selecting maximal number of its elements. We call it the ultrafilter selection property. For cardinality aleph-one the property is eq
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::079ace8977d5e7fd9c292aa9ca73ed70
http://arxiv.org/abs/2104.09633
http://arxiv.org/abs/2104.09633
Autor:
Tristan Bice, Wiesław Kubiś
Inspired by classic work of Wallman and more recent work of Jung-Kegelmann-Moshier and Vickers, we show how to encode general subbases of stably locally compact spaces via certain entailment relations. We further build this up to a categorical dualit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::52018876bceb9246a48b2269baff3978
http://arxiv.org/abs/2006.05099
http://arxiv.org/abs/2006.05099
Autor:
Bartłomiej Skowron, Wiesław Kubiś
Publikováno v:
Studies in Logic, Grammar and Rhetoric, Vol 54, Iss 1, Pp 115-129 (2018)
In order to understand negation as such, at least since Aristotle’s time, there have been many ways of conceptually modelling it. In particular, negation has been studied as inconsistency, contradictoriness, falsity, cancellation, an inversion of a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::034dbfdfda336aee6351a968774b2ee5
https://doaj.org/article/963636f9856b45d6a6756cc0549f74c3
https://doaj.org/article/963636f9856b45d6a6756cc0549f74c3
Publikováno v:
Journal of Functional Analysis. 272:1876-1891
The Gurari\u{\i} space is the unique separable Banach space $\mathbb{G}$ which is of almost universal disposition for finite-dimensional Banach spaces, which means that for every $\varepsilon>0$, for all finite-dimensional normed spaces $E \subseteq
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::900ecb8216a7e61674ac37dea640949e
https://doi.org/10.1016/j.jfa.2016.09.019
https://doi.org/10.1016/j.jfa.2016.09.019
We compare two types of universal operators constructed relatively recently by Cabello S\'anchez, and the authors. The first operator $\Omega$ acts on the Gurarii space, while the second one $P_S$ has values in a fixed separable Banach space $S$. We
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9dc96a3f7d9944a820bb4a5f8fbeb58e
http://arxiv.org/abs/1912.13312
http://arxiv.org/abs/1912.13312
Autor:
Wiesław Kubiś, Saeed Ghasemi
We study the approximately finite-dimensional (AF) $C^*$-algebras that appear as inductive limits of sequences of finite-dimensional $C^*$-algebras and left-invertible embeddings. We show that there is such a separable AF-algebra $\mathcal A_\mathfra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e42eabcb40b3a12de60119d9f39ccad
http://arxiv.org/abs/1903.10392
http://arxiv.org/abs/1903.10392