Zobrazeno 1 - 10
of 554
pro vyhledávání: '"Šemrl, P."'
Autor:
Mori, Michiya, Šemrl, Peter
We study lightlikeness preserving mappings from the $4$-dimensional Minkowski spacetime $\mathcal{M}_4$ to itself under no additional regularity assumptions like continuity, surjectivity, or injectivity. We prove that such a mapping $\phi$ satisfies
Externí odkaz:
http://arxiv.org/abs/2406.18874
Autor:
Semrl, Peter
Let $n$ be a positive integer and $H$ a Hilbert space. The description of the general form of bijective maps on the set of $n$-dimensional subspaces of $H$ preserving the maximal principal angle has been obtained recently. This is a generalization of
Externí odkaz:
http://arxiv.org/abs/2305.18982
Autor:
Mori, Michiya, Šemrl, Peter
Wigner's theorem characterizes isometries of the set of all rank one projections on a Hilbert space. In metric geometry nonexpansive maps and noncontractive maps are well studied generalizations of isometries. We show that under certain conditions Wi
Externí odkaz:
http://arxiv.org/abs/2305.05123
Autor:
Brešar, Matej, Šemrl, Peter
Let $f$ bea noncommutativepolynomial of degree $m\ge 1$ over an algebraically closed field $F$ of characteristic $0$. If $n\ge m-1$ and $\alpha_1,\alpha_2,\alpha_3$ are nonzero elements from $F$ such that $\alpha_1+\alpha_2+\alpha_3=0$, then every tr
Externí odkaz:
http://arxiv.org/abs/2302.05106
Representable implication algebras are known to be axiomatised by a finite number of equations (making the representation and finite representation problems decidable here). We show that this also holds in the context of unary (and binary) relations
Externí odkaz:
http://arxiv.org/abs/2301.02266
Autor:
Jipsen, Peter, Šemrl, Jaš
A binary relation defined on a poset is a weakening relation if the partial order acts as a both-sided compositional identity. This is motivated by the weakening rule in sequent calculi and closely related to models of relevance logic. For a fixed po
Externí odkaz:
http://arxiv.org/abs/2301.02213
Autor:
Matija Bajželj, Matjaž Hladnik, Rok Blagus, Vesna Jurčić, Ana Markež, Tanya Deniz Toluay, Snežna Sodin-Šemrl, Alojzija Hočevar, Katja Lakota
Publikováno v:
Arthritis Research & Therapy, Vol 26, Iss 1, Pp 1-12 (2024)
Abstract Introduction Immunoglobulin A vasculitis (IgAV) in adults has a variable disease course, with patients often developing gastrointestinal and renal involvement and thus contributing to higher mortality. Due to understudied molecular mechanism
Externí odkaz:
https://doaj.org/article/d7a22769529d4e838d81e28100f96503
Autor:
Šemrl, Jaš
The decision problem of membership in the Representation Class of Relation Algebras (RRA) for finite structures is undecidable. However, this does not hold for many Relation Algebra reduct languages. Two well known properties that are sufficient for
Externí odkaz:
http://arxiv.org/abs/2111.01213
Autor:
Semrl, Peter
We prove an optimal version of Wigner's unitary-antiunitary theorem. The main tool in our proof is Gleason's theorem.
Externí odkaz:
http://arxiv.org/abs/2106.06182
Autor:
Šemrl, Jaš
Relational semigroups with domain and range are a useful tool for modelling nondeterministic programs. We prove that the representation class of domain-range semigroups with demonic composition is not finitely axiomatisable. We extend the result for
Externí odkaz:
http://arxiv.org/abs/2106.02709