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JOURNALS // Matematicheskie Zametki // Archive

Mat. Zametki, 1972 Volume 11, Issue 4, Pages 463–470 (Mi mzm9811)

Hall varieites of semigroups

L. A. Skornyakov

M. V. Lomonosov Moscow State University

Abstract: We describe varieties $\mathfrak{B}$ of semigroups such that every retract of a semigroup which is free in $\mathfrak{B}$ is either one-element or free in $\mathfrak{B}$.

UDC: 519.4

Received: 11.05.1971


 English version:
Mathematical Notes, 1972, 11:4, 281–285

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