Results 121 to 130 of about 23,472 (227)
International Journal of Mathematics and Mathematical Sciences, 1988 Let f:X→Y be a continuous semigroup homomorphism. Conditions are given which will ensure that the semigroup X∪Y is a topological semigroup, when the modified Whyburn topology is placed on X∪Y.
Beth Borel Reynolds, Victor Schneider
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Planarity ranks for varieties of equationally noetherian semigroups [PDF]
Известия Саратовского университета. Новая серия: Математика. Механика. ИнформатикаThe problem of describing semigroup varieties with finite planarity rank is researched. In addition to the previously obtained results the author finds new countable infinite series of semigroup varieties with finite planarity rank.
Solomatin, Denis Vladimirovich
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Extensions of semigroups and morphisms of semigroup $C^*$-algebras
Sibirskii matematicheskii zhurnal, 2021 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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, 2007 This paper aims to study the Smarandache cosets and derive some interesting results about them. We prove the classical Lagranges theorem for Smarandache semigroup is not true and that there does not exist a one-to-one correspondence between any two right
Vasantha Kandasamy, W.B.
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On Semigroup Presentations and Efficiency
, 2002 The purpose of this paper is twofold. First we determine some forms of the relations in a finite semigroup presentation with zero deficiency which does or does not define a group. Moreover, we conclude that a finite Rees matrix semigroup Script M sign[G;
Ayik H., Kuyucu F., Vatansever B.
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On quasi-contractivity of C 0-semigroups on Banach spaces [PDF]
, 2004 A basic result in semigroup theory states that every C-0-semigroup is quasi-contractive with respect to some appropriately chosen equivalent norm. This paper contains a counterpart of this well-known fact.
Matolcsi, Máté
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Journal of MathematicsLet X be a nonempty set and TX be the full transformation semigroup on X. For ∅≠Y⊆X, the semigroup of all transformations that leave Y invariant in TX is denoted as SX,Y=f∈TX:fY⊆Y.
Meiqing Qin, Chaoxin Wang, Chuanwen Yu
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Automatic presentations for semigroups [PDF]
, 2012 Special Issue: 2nd International Conference on Language and Automata Theory and Applications (LATA 2008)This paper applies the concept of FA-presentable structures to semigroups.
Cain, Alan James +3 more
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Subsemigroups of virtually free groups : finite Malcev presentations and testing for freeness [PDF]
, 2006 This paper shows that, given a finite subset X of a finitely generated virtually free group F, the freeness of the subsemigroup of F generated by X can be tested algorithmically. (A group is virtually free if it contains a free subgroup of finite index.)
Robertson, Edmund Frederick +2 more
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Recurrency on the Space of Hilbert-Schmidt Operators
مجلة بغداد للعلومIn this paper, it is proved that if a C0-semigroup is chaotic, hypermixing or supermixing, then the related left multiplication C0-semigroup on the space of Hilbert-Schmidt operators is recurrent if and only if it is hypercyclic. Also, it is stated that
Mansooreh Moosapoor
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