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Commutative zeropotent semigroups. (English) Zbl 1145.20321

Summary: Various examples of commutative semigroups \(S(+)\) such that \(S+S=S\) and \(2x+y=2x\) are collected.

MSC:

20M14 Commutative semigroups
20M05 Free semigroups, generators and relations, word problems
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