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Translated from Matematicheskie Zametki, Vol. 38, No. 2, pp. 208–217, August, 1985.
The author is grateful to A. I. Kokorin for his attention to this paper.
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Peryazev, N.A. Positive indistinguishability of algebraic systems, and completeness of positive theories. Mathematical Notes of the Academy of Sciences of the USSR 38, 626–630 (1985). https://doi.org/10.1007/BF01156241
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DOI: https://doi.org/10.1007/BF01156241