• 한국수학교육학회지시리즈B:순수및응용수학
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• 제17권1호
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• pp.81-86
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• 2010

This paper gives some sorts of weakly cancellative of elements which are to be or not to be left magnifying elements in certain semigroups and gives a semilattice congruence in a weakly separative semigroup.