Circulant Boolean relation matrices
Classes de semigroups immersibles dans des groupes.
Classes of Regularity in Semigroups
Classification of Sn-normal semigroups.
Clifford congruences on generalized quasi-orthodox GV-semigroups
A semigroup S is said to be completely π-regular if for any a ∈ S there exists a positive integer n such that aⁿ is completely regular. A completely π-regular semigroup S is said to be a GV-semigroup if all the regular elements of S are completely regular. The present paper is devoted to the study of generalized quasi-orthodox GV-semigroups and least Clifford congruences on them.
Clifford semifields
It is well known that a semigroup S is a Clifford semigroup if and only if S is a strong semilattice of groups. We have recently extended this important result from semigroups to semirings by showing that a semiring S is a Clifford semiring if and only if S is a strong distributive lattice of skew-rings. In this paper, we introduce the notions of Clifford semidomain and Clifford semifield. Some structure theorems for these semirings are obtained.
Closed ideals in semigroups of continuous selfmaps.
Closure operations and semigroups of quotients
Closure operators and generating sets
Closure operators on languages and binary relations.
Codes avec des mots infinis
Codes limites et factorisations finies du monoïde libre
Coding in the existential theory of concatenation.
Codomain of the tensor product of semigroups
Cohomology groups of a groupoid.
Colimits of representable algebra-valued functors.
Combinatorial properties of products of graphs
Combinatorial results for semigroups of order-decreasing partial transformations.
Combinatoric of syzygies for semigroup algebras.
We describe how the graded minimal resolution of certain semigroup algebras is related to the combinatorics of some simplicial complexes. We obtain characterizations of the Cohen-Macaulay and Gorenstein conditions. The Cohen-Macaulay type is computed from combinatorics. As an application, we compute explicitly the graded minimal resolution of monomial both affine and simplicial projective surfaces.
Comments on the permutation property for semigroups.