Commutative zeropotent semigroups
Transitive closures of binary relations II.
On separating sets of words. III.
On separating sets of words. IV.
On separating sets of words. V.
On separating sets of words. II.
Bi-ideal-simple semirings
Commutative congruence-simple semirings were studied in [2] and [7] (but see also [1], [3]--[6]). The non-commutative case almost (see [8]) escaped notice so far. Whatever, every congruence-simple semiring is bi-ideal-simple and the aim of this very short note is to collect several pieces of information on these semirings.
Transitive closures of binary relations. III.
On separating sets of words. I.
Transitive closures of binary relations. I.
Trees in commtative nil-semigroups of index two
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