Results 101 to 110 of about 1,026,932 (240)
Controllability of Fractional Control Systems With Deformable Dynamics in Finite‐Dimensional Spaces
Journal of Mathematics, Volume 2026, Issue 1, 2026.In this work, we investigate the controllability of fractional control systems for deformable bodies in finite‐dimensional spaces. To achieve this, we employ a methodology based on the fractional exponential matrix associated with deformable bodies, the controllability Gramian matrix, and an iterative technique.
Boulkhairy Sy, Cheikh Seck, A. M. Nagy
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Revisiting Hazard Ratios: Can We Define Causal Estimands for Time‐Dependent Treatment Effects?
Biometrical Journal, Volume 67, Issue 6, December 2025.ABSTRACT In this paper, some aspects concerning the causal interpretation of hazard contrasts are revisited. It is first investigated, in which sense the hazard ratio constitutes a causal effect. It is demonstrated that the hazard ratio at a timepoint t$t$ represents a causal effect for the population at baseline, but in general not for any population ...
Dominic Edelmann
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Subsemigroups of inverse semigroups
Le Matematiche, 1996 See directly the article.
Boris M. Schein
doaj
Vladimirov–Pearson operators on ζ$\zeta$‐regular ultrametric Cantor sets
Mathematische Nachrichten, Volume 298, Issue 12, Page 3779-3790, December 2025.Abstract A new operator for certain types of ultrametric Cantor sets is constructed using the measure coming from the spectral triple associated with the Cantor set, as well as its zeta function. Under certain mild conditions on that measure, it is shown that it is an integral operator similar to the Vladimirov–Taibleson operator on the p$p$‐adic ...
Patrick Erik Bradley
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Topological graph inverse semigroups
Topology and its Applications, 2016 25 pages.
Mesyan, Z. +3 more
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Complete positivity order and relative entropy decay
Forum of Mathematics, SigmaWe prove that for a GNS-symmetric quantum Markov semigroup, the complete modified logarithmic Sobolev constant is bounded by the inverse of its complete positivity mixing time.
Li Gao +3 more
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A simplification of D'Alarcao's idempotent separating extensions of inverse semigroups
International Journal of Mathematics and Mathematical Sciences, 1978 In [2] D'Alarcao states necessary and sufficient conditions for the attainment of an idempotent-separating extension of an inverse semigroup. To do this D'Alarcao needed essentially three mappings satisfying thirteen conditions.
Constance C. Edwards
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Pseudo-amenability and pseudo-contractibility of restricted semigroup algebra
Annales Universitatis Paedagogicae Cracoviensis: Studia Mathematica, 2018 In this article the pseudo-amenability and pseudo-contractibility of restricted semigroup algebra lr1(S) and semigroup algebra, l1(Sr) on restricted semigroup, Sr are investigated for different classes of inverse semigroups such as Brandt semigroup, and ...
Olufemi Johnson Ogunsola +1 more
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Free locally inverse *-semigroups [PDF]
Czechoslovak Mathematical Journal, 1993 Let \((S,.)\) be a semigroup endowed with an additional unary operation \(x \to x^*\) satisfying: 1) \((xy)^* = y^*x^*\), 2) \((x^*)^* = x\), 3) \(xx^*x = x\). Then \((S,.,*)\) is called a regular \(*\)-semigroup. If in addition \((S,.,*)\) is locally inverse, i.e. each local submonoid \(eSe\) \((e \in E_ S)\) of \((S,.,*)\) is inverse, then \(S\) is a
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Restricted Algebras on Inverse Semigroups—Part II: Positive Definite Functions
International Journal of Mathematics and Mathematical Sciences, 2011 The relation between representations and positive definite functions is a key concept in harmonic analysis on topological groups. Recently this relation has been studied on topological groupoids.
Massoud Amini, Alireza Medghalchi
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