Relation products of congruences and factor congruences
Jaromír Duda · Czechoslovak Mathematical Journal · 1991
Let A u A 2 be algebras of the same type.Denote by % { the canonical projection from the Cartesian productFactor congruences and subfactor congruences were introduced by J. Hagemann [5] ; see also H.-P. Gumm [4] for further information.The present paper studies four congruence properties on the product A l x A 2 which are related to permutability and "3 l/2-permutability" of congruences on A 1 x A 2 with factor congruences П х and Я 2 .For the sake of brevity, denote the sequence p u ..., p m by p.