Geodesic
On left C-U-liberal semigroups
Czechoslovak Mathematical Journal, Tome 56 (2006) no. 4, pp. 1085-1108.

Voir la notice de l'article dans Czech Digital Mathematics Library

In this paper the equivalence Q~U on a semigroup S in terms of a set U of idempotents in S is defined. A semigroup S is called a U-liberal semigroup with U as the set of projections and denoted by S(U) if every Q~U-class in it contains an element in U. A class of U-liberal semigroups is characterized and some special cases are considered.
Classification : 20M10
Mots-clés : equivalence Q~U; left C-U-liberal semigroup; left semi-spined product; band-formal construction; left C-liberal semigroup 
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     title = {On left $C$-$\scr U$-liberal semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1085--1108},
     publisher = {mathdoc},
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     number = {4},
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     zbl = {1157.20334},
     language = {en},
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He, Yong; Shao, Fang; Li, Shi-qun; Gao, Wei. On left $C$-$\scr U$-liberal semigroups. Czechoslovak Mathematical Journal, Tome 56 (2006) no. 4, pp. 1085-1108. https://geodesic-test.mathdoc.fr/item/CMJ_2006__56_4_a1/