Commutative archimedean cancellative semigroups without idempotent
Takayuki Tamura (1969-1970)
Séminaire Dubreil. Algèbre et théorie des nombres
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Takayuki Tamura (1969-1970)
Séminaire Dubreil. Algèbre et théorie des nombres
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T. Tamura (1969)
Bulletin de la Société Mathématique de France
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Robert El Bashir, Tomáš Kepka (2008)
Czechoslovak Mathematical Journal
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Commutative semigroups satisfying the equation and having only two -invariant congruences for an automorphism group are considered. Some classes of these semigroups are characterized and some other examples are constructed.
Nobuaki Kuroki (1973)
Czechoslovak Mathematical Journal
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Jaroslav Ježek, Tomáš Kepka, Petr Němec (2008)
Mathematica Bohemica
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Every commutative nil-semigroup of index 2 can be imbedded into such a semigroup without irreducible elements.