Abstract. This article corrects errors in two previous papers.
AMS Subject Classification
(1991): 20M14
Keyword(s):
complete,
completion,
subcomplete,
finitely generated commutative semigroup,
Ponizovsky family,
{\cal K},
-class,
Schützenberger monoid,
extended Schützenberger functor
Received July 20, 2001. (Registered under 2808/2009.)
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