Abstract
A semigroup identity is alternating if it is formed by a simple word and an almost simple word. A complete description of all hereditarily finitely based, alternating identities is presented. This answers a question of György Pollák and Mikhail V. Volkov posted in the 1980s.
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References
A.P. Birjukov, Varieties of idempotent semigroups. Algebra Log. 9, 153–164, (1970); translation of Algebra i Logika, 9, 255–273, (1970)
C.F. Fennemore, All varieties of bands. I, II. Math. Nachr. 48, 237–252, 253–262 (1971)
J.A. Gerhard, The lattice of equational classes of idempotent semigroups. J. Algebra 15, 195–224 (1970)
J.M. Howie, Fundamentals of Semigroup Theory (Clarendon Press, Oxford, 1995)
J. Kad’ourek, Uncountably many varieties of semigroups satisfying \(x^2y\) \(xy\), Semigroup Forum, 60 (2000), 135–152
G.I. Mashevitzky, On identities in varieties of completely simple semigroups over abelian groups, in Modern Algebra (Leningrad, St Petersburg,1978), pp. 81–89 (in Russian)
P. Perkins, Bases for equational theories of semigroups. J. Algebra 11, 298–314 (1969)
G. Pollák, On hereditarily finitely based varieties of semigroups. Acta Sci. Math. (Szeged) 37, 339–348 (1975)
G. Pollák, A class of hereditarily finitely based varieties of semigroups, in Algebraic Theory of Semigroups (Szeged, 1976), Colloquia Mathematica Societatis János Bolyai , vol. 20 (North-Holland, Amsterdam, 1979), pp. 433–445
G. Pollák, On identities which define hereditarily finitely based varieties of semigroups, in Algebraic Theory of Semigroups (Szeged, 1976), Colloquia Mathematica Societatis János Bolyai, vol. 20, (North-Holland, Amsterdam, 1979), pp. 447–452
G. Pollák, On two classes of hereditarily finitely based semigroup identities. Semigroup Forum 25, 9–33 (1982)
G. Pollák, Some sufficient conditions for hereditarily finitely based varieties of semigroups. Acta Sci. Math. (Szeged) 50, 299–330 (1986)
G. Pollák, M.V. Volkov, On almost simple semigroup identities, in Semigroups (Szeged, 1981), Colloquia Mathematica Societatis János Bolyai, vol. 39 (North-Holland, Amsterdam, 1985), pp. 287–323
V.V. Rasin, On the lattice of varieties of completely simple semigroups. Semigroup Forum 17, 113–122 (1979)
M.V. Volkov, György Pollák’s work on the theory of semigroup varieties: its significance and its influence so far. Acta Sci. Math. (Szeged) 68, 875–894 (2002)
Acknowledgments
The author is grateful to the anonymous reviewer for suggestions, and to Mikhail V. Volkov for information on heterotypical, alternating identities.
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Lee, E.W.H. On a question of Pollák and Volkov regarding hereditarily finitely based identities. Period Math Hung 68, 128–134 (2014). https://doi.org/10.1007/s10998-014-0018-3
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DOI: https://doi.org/10.1007/s10998-014-0018-3