Results 21 to 30 of about 244 (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
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
core +2 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
core +1 more source
Reachability problems for products of matrices in semirings [PDF]
, 2002 We consider the following matrix reachability problem: given $r$ square matrices with entries in a semiring, is there a product of these matrices which attains a prescribed matrix? We define similarly the vector (resp.
Baccelli F. +11 more
core +5 more sources
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
core +1 more source
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
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
, 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
core +3 more sources
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
core +1 more source
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