Results 21 to 30 of about 248 (32)
New Representations of Matroids and Generalizations [PDF]
, 2011 We extend the notion of matroid representations by matrices over fields and consider new representations of matroids by matrices over finite semirings, more precisely over the boolean and the superboolean semirings.
Izhakian, Zur, Rhodes, John
core +3 more sources
A Svarc-Milnor lemma for monoids acting by isometric embeddings
, 2010 We continue our programme of extending key techniques from geometric group theory to semigroup theory, by studying monoids acting by isometric embeddings on spaces equipped with asymmetric, partially-defined distance functions.
de la Harpe P. +4 more
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Free monoids are coherent [PDF]
, 2015 A monoid S is said to be right coherent if every finitely generated subact of every finitely presented right S-act is finitely presented. Left coherency is defined dually and S is coherent if it is both right and left coherent.
Gould, Victoria +2 more
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Presentations and representations of surface singular braid monoids
, 2017 The surface singular braid monoid corresponds to marked graph diagrams of knotted surfaces in braid form. In a quest to resolve linearity problem for this monoid, we will show that if it is defined on at least two or at least three strands, then its two ...
Jablonowski, Michal
core +1 more source
Partial Category Actions on Sets and Topological Spaces
, 2017 We introduce (continuous) partial category actions on sets (topological spaces) and show that each such action admits a universal globalization. Thereby, we obtain a simultaneous generalization of corresponding results for groups, by Kellendonk and ...
Nystedt, Patrik
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On geometrically equivalent S-acts [PDF]
, 2011 In this paper, considering the geometric equivalence for algebras of a variety $_{S}A$ of S-acts over a monoid S, we obtain representation theorems describing all types of the equivalence classes of geometrically equivalent S-acts of varieties $_{S}A ...
Katsov, Yefim
core
, 2014 A monoid $M$ is called surjunctive if every injective cellular automata with finite alphabet over $M$ is surjective. We show that all finite monoids, all finitely generated commutative monoids, all cancellative commutative monoids, all residually finite ...
Ceccherini-Silberstein, Tullio +1 more
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Construction noise database (phase 3): Evaluation of established measurement protocol [PDF]
, 2006 Executive Summary 1.1 The established method for obtaining noise emission data for the update of a database of noise from construction plant is examined. 1.2 The established measurement protocol involves the collection of plant noise measurements using
Moorhouse, AT, Waddington, DC
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A new genus Neobelonopsis and two new species of Trichobelonium (Helotiales, Ascomycota) discovered mainly from poaceous grasses native to Asia in Japan. [PDF]
MycoKeys, 2023 Itagaki H, Hosoya T.
europepmc +1 more source
Semigroup identities of tropical matrices through matrix ranks
, 2018 We prove the conjecture that, for any $n$, the monoid of all $n \times n$ tropical matrices satisfies nontrivial semigroup identities. To this end, we prove that the factor rank of a large enough power of a tropical matrix does not exceed the tropical ...
Izhakian, Zur, Merlet, Glenn
core