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On some operations on classes of algebras. (English) Zbl 0272.08006


MSC:

08B99 Varieties
08Axx Algebraic structures
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References:

[1] Birkhoff, G., Lattice theory, vi-vi (1967), New York: Amer. Math. Soc., New York · Zbl 0153.02501
[2] S. D. Comer and J. S. Johnson,The standard semigroup of operators of a variety, Alg. Univ. To appear. · Zbl 0266.08003
[3] Grätzer, G.; Lakser, H., The structure of pseudocomplemented distributive lattices II. Congruence extension and amalgamation, Transactions Amer. Math. Soc., 156, 343-358 (1971) · Zbl 0244.06011 · doi:10.2307/1995616
[4] Grätzer, G.; Lakser, H.; Płonka, J., Joins and direct products of equational classes, Canad. Math. Bull., 12, 741-744 (1969) · Zbl 0188.04903
[5] Henkin, L.; Monk, J. D.; Tarski, A., Cylindric algebras. Part I, vi-vi (1971), Amsterdam: North-Holland Publishing Co., Amsterdam
[6] Higgins, J. C., Subsemigroups of the additive positive integers, Fibonacci Quart., 10, 225-230 (1972) · Zbl 0239.20081
[7] Hu, T.-K.; Kelenson, P., Independence and direct factorization of universal algebras, Math. Nachr., 51, 83-99 (1971) · Zbl 0204.33104 · doi:10.1002/mana.19710510108
[8] Nemitz, W.; Whaley, T., Varieties of implicative semilattices, Pac. J. Math., 37, 759-769 (1971) · Zbl 0243.06003
[9] Neumann, B. H., Varieties of groups, Bull. Amer. Math. Soc., 73, 603-613 (1967) · Zbl 0149.26704 · doi:10.1090/S0002-9904-1967-11795-6
[10] Neumann, P. M., The inequality of SQPS and QSP as operators on classes of groups, Bull. Amer. Math. Soc., 76, 1067-1069 (1970) · Zbl 0209.32102 · doi:10.1090/S0002-9904-1970-12562-9
[11] Pigozzi, D., On some operations on classes of algebras, Notices Amer. Math. Soc., 13, 829-829 (1966)
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