منابع مشابه
Presentations of Semigroup Algebras of Weighted Trees
We find presentations for subalgebras of invariants of the coordinate algebras of binary symmetric models of phylogenetic trees studied by Buczynska and Wisniewski in [BW]. These algebras arise as toric degenerations of rings of global sections of weight varieties of the Grassmanian of two planes associated to the Plücker embedding, and as toric degenerations of rings of invariants of Cox-Nagat...
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In this paper we exhibit a type of semigroup presentations which determines a class of local groups. We show that the finite elements of this class generate the pseudovariety LG of all finite local groups and use them as test-semigroups to prove that LG and S, the pseudovariety of all finite semigroups, verify the same κ-identities involving κ-terms of rank at most 1, where κ denotes the implic...
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— In this work we study some objects describing the addition behavior of a numerical semigroup and we prove that they uniquely determine the numerical semigroup. We then study the case of Arf numerical semigroups and find some specific results. Résumé (Comportement de l’addition dans un semi-groupe numérique). — Dans ce travail, nous étudions des objets qui décrivent le comportement de l’additi...
متن کاملComparing semigroup and monoid presentations for finite monoids
It is known that for any finite group G given by a finite group presentation 〈A |R 〉 there exists a finite semigroup presentation 〈 B | Q 〉 for G of the same deficiency, i.e. satisfying |Q| − |B| = |R| − |A|. It is also known that the analogous statement does not hold for all finite monoids. In this paper we give a necessary and sufficient condition for a finite monoid M , given by a finite mon...
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ژورنال
عنوان ژورنال: Global Journal of Mathematical Analysis
سال: 2020
ISSN: 2307-9002
DOI: 10.14419/gjma.v8i1.30464