On the approximation of the Boolean powers by Cartesian powers. (English) Zbl 0844.08002

Summary: On the basis of the Mal’tsev-Cleave theorem on quasi-universal formulas, it is proved that a number of properties of congruences, tolerances, quasiorders can be transported from finite Cartesian powers of algebraic systems to any Boolean powers.


08A05 Structure theory of algebraic structures
08A30 Subalgebras, congruence relations
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