Pierre Antoine Grillet
Acta Sci. Math. (Szeged) 63:3-4(1997), 463-469
Abstract. Let $S$ be a finite commutative groupfree semigroup. Then $H^2(S,A) = 0$ for all functors $A$ if and only if $S$ is a semilattice.
AMS Subject Classification
(1991): 20M50, 20M14
Received March 30, 1995. (Registered under 5777/2009.)
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