Oladapo Adekunle Ojo, Fatma Salim Ali Al-Kharousi, A. Umar
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引用次数: 0
Abstract
Let be the partial symmetric semigroup on and let and be its subsemigroups of order-preserving contractions and order-preserving, order-decreasing contractions mappings of , respectively. In this paper we investigate the cardinalities of and , the set idempotents of and , respectively. We also investigate the cardinalities of certain equivalences on and .
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