20M50 08B20 4 17A30 4 20M10 4 semigroup 4 17D99 2 doppelsemigroup 2 interassociativity 2 strong doppelsemigroup 2 06F05 1 20M05 1 Morita context 1 Morita equivalence for pomonoids 1 Morita invariant 1 Po-\(\Gamma\)-semigroup 1 \(n\)-tuple semigroup 1 cohomological dimension 1 cohomology of semigroups 1 congruence 1 dimonoid 1 free \(n\)-tuple semigroup 1 free semigroup 1 free trioid 1 quasi-ideal 1 relatively free \(n\)-tuple semigroup 1 trioid 1