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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:

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[8] W. Nemitz and T. Whaley,Varieties of implicative semilattices, Pac. J. Math.37 (1971), 759–769. · Zbl 0243.06003
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[10] P. M. Neumann,The inequality of SQPS and QSP as operators on classes of groups, Bull. Amer. Math. Soc.76 (1970), 1067–1069. · Zbl 0209.32102
[11] D. Pigozzi,On some operations on classes of algebras. Notices Amer. Math. Soc.13 (1966), 829.
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