Results 211 to 220 of about 17,862 (236)

On d-semigroups, r-semigroups, dr-semigroups and their subclasses

Semigroup Forum, 2022
A \textit{d-semigroup} (resp. \textit{r-semigroup}) is a semigroup \((S,\cdot)\) with a unary operation \(x\mapsto x^+\) (resp. \(x\mapsto x^*\)) satisfying the identities \begin{align*} x^+\cdot x &= x,\ (x\cdot y)^+ = (x\cdot y^+)^+.\\ (\text{resp. }x\cdot x^* &= x,\ (y\cdot x)^* = (y^*\cdot x)^*.) \end{align*} \textit{dr-semigroups} are two-sided ...
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On Finite Semigroups Embeddable in Inverse Semigroups

Semigroup Forum, 2001
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Subgroups of the Power Semigroup of a Finite Semigroup

Canadian Journal of Mathematics, 1979
Throughout this paper, S will denote a finite semigroup and Z+ the set of positive integers. E = E(S) denotes the set of idempotents of S. Let . If , then let AB = {ab| a ∈ A, b ∈ B}. has been studied by many authors, including [2, 3, 5, 6, 7]. If X is a set, then |X| denotes the cardinality of X. For undefined terms in this paper, see [1,4].THEOREM 1.
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C-semigroups and strongly continuous semigroups

Israel Journal of Mathematics, 1993
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Semigroups and Semigroup Rings

2023
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On U-orthodox semigroups

Science in China Series A: Mathematics, 2009
Xueming Ren, Yanhui Wang, Kar Ping Shum   +2 more
exaly  

Chaos for semigroups of unbounded operators

Mathematische Nachrichten, 2003
R Delaubenfels, H Emamirad
exaly  

Fuzzy bi-ideals in ordered semigroups

Information Sciences, 2005
Niovi Kehayopulu, Michael Tsingelis
exaly  

Cyclotomic Numerical Semigroups

SIAM Journal on Discrete Mathematics, 2016
Alexandru Ciolan, P A Garcia-Sanchez, Pieter Moree   +2 more
exaly  

Left Abundant Semigroups

Communications in Algebra, 2004
Xiaojiang Guo, K P Shum
exaly