MATHEMATICA BOHEMICA, Vol. 120, No. 4, pp. 445-447, 1995

Subtraction semigroups

Bohdan Zelinka

Bohdan Zelinka, katedra diskretni matematiky a statistiky Technicke university, Voronezska 13, 460 01 Liberec

Abstract: A subtraction semigroup is a semigroup $(A,\ldotp,-)$ with a further operation "$-$" added, called subtraction and satisfying certain axioms. The paper concerns a problem by B. M. Schein concerning the structure of multiplication in a subtraction semigroup.

Keywords: subtraction semigroup, subtraction algebra, Boolean algebra

Classification (MSC91): 20M20, 06E05

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