GLOBALLY DETERMINED ALGEBRAS

GLOBALLY DETERMINED ALGEBRAS

This paper is a contribution to the study of the isomorphism problems for algebras. Among the isomorphism problems, that of global determination is investigated here. That is, our investigation of the problems is concerned with the question whether two algebras are isomorphic when their globals are isomorphic. The answer is not always affirmative. The counterexample, due to E. M. Mogiljanskaja, is the class of all infinite semigroups. But T. Tamura and J. Shafer [6] proved that the class of all groups is globally determined and announced the same result for the class of rectangular bands. Vazenin [7] proved that for any set X, the transformation semigroup $T_{X}$ must be isomorphic to any semigroup S for any P(S)$\simeq$P($T_{X}).(omitted)