• 한국수학교육학회지시리즈B:순수및응용수학
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• 제9권2호
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• pp.119-128
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• 2002

We here characterize semigroups (which are called completely right projective semigroups) for which every S-automaton is projective, and then examine some of the relationships with the semigroups (which are called completely right injective semigroups) in which every S-automaton is injective.