Browsing Research Articles (Mathematics and Applied Mathematics) by Author "Moraschini, Tommaso"

Browsing Research Articles (Mathematics and Applied Mathematics) by Author "Moraschini, Tommaso"

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  • Epimorphism surjectivity in varieties of Heyting algebras 
    Moraschini, Tommaso; Wannenburg, Johann Joubert (Elsevier, 2020-10)
    Please read abstract in the article.
  • Epimorphisms in varieties of residuated structures 
    Bezhanishvili, Guram; Moraschini, Tommaso; Raftery, James G. (Elsevier, 2017-12)
    It is proved that epimorphisms are surjective in a range of varieties of residuated structures, including all varieties of Heyting or Brouwerian algebras of finite depth, and all varieties consisting of Gödel algebras, ...
  • Epimorphisms in varieties of subidempotent residuated structures 
    Moraschini, Tommaso; Raftery, James G.; Wannenburg, Johann Joubert (Springer, 2021-01)
    Please read abstract in the article.
  • 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 ...
  • On prevarieties of logic 
    Moraschini, Tommaso; Raftery, James G. (Springer, 2019-09)
    It is proved that every prevariety of algebras is categorically equivalent to a ‘prevariety of logic’, i.e., to the equivalent algebraic semantics of some sentential deductive system. This allows us to show that no nontrivial ...
  • Singly generated quasivarieties and residuated structures 
    Moraschini, Tommaso; Raftery, James G.; Wannenburg, Johann Joubert (Wiley, 2020-07)
    Please read abstract in the article.
  • Varieties of De Morgan monoids : covers of atoms 
    Moraschini, Tommaso; Raftery, James G.; Wannenburg, Johann Joubert (Cambridge University Press, 2020)
    The variety DMM of De Morgan monoids has just four minimal subvarieties. The join-irreducible covers of these atoms in the subvariety lattice of DMM are investigated. One of the two atoms consisting of idempotent algebras ...
  • Varieties of De Morgan monoids : minimality and irreducible algebras 
    Moraschini, Tommaso; Raftery, James G.; Wannenburg, Johann Joubert (Elsevier, 2019-07)
    Please read abstract in the article.