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The standard semigroup of operators of a variety. (English) Zbl 0266.08003


MSC:

08B99 Varieties
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References:

[1] E. Nelson,Finiteness of semigroups of operators in universital algebras. Can. J. Math.19 (1967), pp. 764–768. · Zbl 0149.26004
[2] P. Neumann,The inequality of SQPS and QSP as operators on classes of groups. Bull. Amer. Math. Soc.76 (1970), 1067–1069. · Zbl 0209.32102
[3] D. Pigozzi,On some operations on classes of algebras. Notices American Mathematical Society13 (1966) p. 829. · Zbl 0272.08006
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