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Translated from Algebra i Logika, Vol. 9, No. 6, pp. 667–671, November–December, 1970.
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Zil'ber, B.I. On the isomorphism and elementary equivalence of commutative semigroups. Algebr Logic 9, 400–402 (1970). https://doi.org/10.1007/BF02219044
- Mathematical Logic
- Commutative Semigroup