Geodesic
Subtraction semigroups
Mathematica Bohemica, Tome 120 (1995) no. 4, pp. 445-447

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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.
DOI : 10.21136/MB.1995.126093
Classification : 06E05, 06F05, 08A02, 20M10, 20M20
Keywords: difference semigroups; identities; semigroup reducts; subtraction semigroups; subtraction algebra; Boolean algebra 
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Zelinka, Bohdan. Subtraction semigroups. Mathematica Bohemica, Tome 120 (1995) no. 4, pp. 445-447. doi: 10.21136/MB.1995.126093

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