It is shown that a quasivariety has the extension property for all relative congruences if it has the extension property for principal relative congruences. This generalizes the analogous result for varieties, due to A. Day. The proof differs from Day's in that it avoids the use of Zorn's Lemma.
KeywordsAnalogous Result Extension Property Relative Congruence Congruence Extension Property Principal Relative Congruence
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