Results 71 to 80 of about 1,290 (174)
On generalized Ehresmann semigroups
Open Mathematics, 2017 As a generalization of the class of inverse semigroups, the class of Ehresmann semigroups is introduced by Lawson and investigated by many authors extensively in the literature.
Wang Shoufeng
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SEMILATTICES AND K-FINITE OBJECTS
Revista de Matemática: Teoría y Aplicaciones, 2017 We prove that for X Є ǀ E ǀ, E elementary topos, the following properties are equivalent: (a) X is K-finite, (b) for every upper semilattice B, the diagonal B → BX has a left adjoint.
OSVALDO ACUÑA ORTEGA
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Regularity of semilattice sums of rings [PDF]
, 1973 If R R is a supplementary semilattice sum of subrings R α , α ∈ Ω {R_\alpha },\alpha \in \Omega , then R R is regular ...
John Janeski, Julian Weissglass
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Sequences suffice for pointfree uniform completions
Journal of the London Mathematical Society, Volume 112, Issue 2, August 2025.Abstract Completions of metric spaces are usually constructed using Cauchy sequences. However, this does not work for general uniform spaces, where Cauchy filters or nets must be used instead. The situation in pointfree topology is more straightforward: the correct completion of uniform locales can indeed be obtained as a quotient of a locale of Cauchy
Graham Manuell
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The semigroup of nonempty finite subsets of rationals
International Journal of Mathematics and Mathematical Sciences, 1988 Let Q be the additive group of rational numbers and let ℛ be the additive semigroup of all nonempty finite subsets of Q. For X∈ℛ, define AX to be the basis of 〈X−min(X)〉 and BX the basis of 〈max(X)−X〉.
Reuben Spake
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On the Semantics and the Ontology of the Mass‐Count Distinction
Philosophy Compass, Volume 20, Issue 3, March 2025.ABSTRACT The mass‐count distinction is a morpho‐syntactic distinction among nouns in English and many other languages. Tree, chair, person, group, and portion are count nouns, which come with the plural and accept numerals such as one and first; water, rice, furniture, silverware, and law enforcement are mass nouns, which lack the plural and do not ...
Friederike Moltmann
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Trees with Unique Least Central Subtrees
Discussiones Mathematicae Graph Theory, 2018 A subtree S of a tree T is a central subtree of T if S has the minimum eccentricity in the join-semilattice of all subtrees of T. Among all subtrees lying in the join-semilattice center, the subtree with minimal size is called the least central subtree ...
Kang Liying, Shan Erfang
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Truthmaker Semantics and Natural Language Semantics
Language and Linguistics Compass, Volume 19, Issue 1, January/February 2025.ABSTRACT Truthmaker semantics is a non‐classical logical framework that has recently garnered significant interest in philosophy, logic, and natural language semantics. It redefines the propositional connectives and gives rise to more fine‐grained entailment relations than classical logic.
Lucas Champollion
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The Poincaré‐extended ab$\mathbf {a}\mathbf {b}$‐index
Journal of the London Mathematical Society, Volume 111, Issue 1, January 2025.Abstract Motivated by a conjecture concerning Igusa local zeta functions for intersection posets of hyperplane arrangements, we introduce and study the Poincaré‐extended ab$\mathbf {a}\mathbf {b}$‐index, which generalizes both the ab$\mathbf {a}\mathbf {b}$‐index and the Poincaré polynomial.
Galen Dorpalen‐Barry +2 more
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Mal'cev products in the general theory of semilattice sums of algebras [PDF]
, 2022 Semilattice sums are a class of algebraic construction techniques for building new algebras out of families of similar structures arranged over a semilattice.
FUSCO, LUDOVICO
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