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Browsing Research Articles (Mathematics and Applied Mathematics) by Author "Wannenburg, Johann Joubert"

Now showing items 1-7 of 7

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 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 ...
Semilinear De Morgan monoids and epimorphisms

Wannenburg, Johann Joubert; Raftery, James G. (Springer, 2024-01)

A representation theorem is proved for De Morgan monoids that are (i) semilinear, i.e., subdirect products of totally ordered algebras, and (ii) negatively generated, i.e., generated by lower bounds of the neutral element. ...
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.

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Browsing Research Articles (Mathematics and Applied Mathematics) by Author "Wannenburg, Johann Joubert"

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