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On two classes of hereditarily finitely based semigroup identities. (English) Zbl 0496.20042


MSC:

20M07 Varieties and pseudovarieties of semigroups
08B15 Lattices of varieties

Citations:

Zbl 0412.20055
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References:

[1] Clifford, A.H. and G.B. Preston,The Algebraic Theory of Semigroups, Vol. II, Math. Surveys No. 7, Amer. Math. Soc., Providence, R.I., 1967. · Zbl 0178.01203
[2] Higman, G.,Ordering by divisibility in abstract algebras, Proc. London Math. Soc., Ser. 3, 2 (1952), 326–336. · Zbl 0047.03402 · doi:10.1112/plms/s3-2.1.326
[3] Kruskal, J.B.,Well-quasi-ordering, the Tree Theorem, and Vazsonyi’s conjecture, Trans. Amer. Math. Soc. 95 (1960), 210–225. · Zbl 0158.27002
[4] Pollák, G.,On hereditarily finitely based varieties of semigroups, Acta Sci. Math. Szeged, 37 (1975), 339–348. · Zbl 0324.20079
[5] –,A class of hereditarily finitely based varieties of semigroups, Algebraic Theory of Semigroups, Coll. Math. Soc. János Bolyai 20, Szeged, 1976, pp. 433–445.
[6] –,On identities which define hereditarily finitely based varieties of semigroups, Algebraic Theory of Semigroups, Coll. Math. Soc. János Bolyai 20, Szeged, 1976, pp. 447–452.
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