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Currently displaying 1 – 2 of 2

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On left $C$ - $𝒰$ -liberal semigroups

Yong He; Fang Shao; Shi-qun Li; Wei Gao — 2006

Czechoslovak Mathematical Journal

In this paper the equivalence ${\tilde{𝒬}}^{U}$ 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 ${\tilde{𝒬}}^{U}$ -class in it contains an element in $U$ . A class of $𝒰$ -liberal semigroups is characterized and some special cases are considered.

Skew semi-invariant submanifolds of a locally product manifold.

Liu, Ximin; Shao, Fang-Ming — 1999

Portugaliae Mathematica

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