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Rough ideals in semigroups. (English) Zbl 0916.20046

Summary: We introduce the notion of a rough left [right, two-sided, bi-] ideal in a semigroup, which is an extended notion of a left [right, two-sided, bi-] ideal in a semigroup, and give some properties of such ideals.

MSC:

20M12 Ideal theory for semigroups
20N25 Fuzzy groups
03E72 Theory of fuzzy sets, etc.
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