2 papers
math.CT2010
Categories of partial algebras for critical points between varieties of algebras
Pierre Gillibert
A lifting of a semilattice S is an algebra A such that the semilattice of compact (=finitely generated) congruences of A is isomorphic to S. The aim of this work is to give a categ…
math.RA2008
Critical points of pairs of varieties of algebras
Pierre Gillibert
For a class V of algebras, denote by Conc(V) the class of all semilattices isomorphic to the semilattice Conc(A) of all compact congruences of A, for some A in V. For classes V1 an…