Browsing Research Articles (Mathematics and Applied Mathematics) by Subject "Quasivariety"

Browsing Research Articles (Mathematics and Applied Mathematics) by Subject "Quasivariety"

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  • Epimorphisms, definability and cardinalities 
    Moraschini, Tommaso; Raftery, James G.; Wannenburg, Johann Joubert (Springer, 2020-04)
    We characterize, in syntactic terms, the ranges of epimorphisms in an arbitrary class of similar first-order structures (as opposed to an elementary class). This allows us to strengthen a result of Bacsich, as follows: in ...
  • Relative congruence formulas and decompositions in quasivarieties 
    Campercholi, M.A.; Raftery, James G. (Springer, 2017-11)
    Quasivarietal analogues of uniform congruence schemes are discussed, and their relationship with the equational definability of principal relative congruences (EDPRC) is established, along with their significance for ...