No semigroup is a finite union of mutants.
J.B. Kirn (1974)
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J.B. Kirn (1974)
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John Isbell (1974)
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J. Schmidt (1971)
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B.P. jr. Brooks, W.E. Clark (1971)
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A.B. Engel (1972)
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C . Vachuska, P. Vachuska (1993)
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S. Schwarz (1971)
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Ki-Hang, Kim Butler (1974)
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K. Ahre (1984)
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