The possible values of critical points between varieties of lattices

Details The possible values of critical points between varieties of lattices The possible values of critical points between varieties of lattices

2010-03-30

arxiv.org/abs/1003.5742v2

Mathematics

Logic

26 pages

Scientific paper

We denote by Conc(L) the semilattice of all finitely generated congruences of a lattice L. For varieties (i.e., equational classes) V and W of lattices such that V is contained neither in W nor its dual, and such that every simple member of W contains a prime interval, we prove that there exists a bounded lattice A in V with at most aleph 2 elements such that Conc(A) is not isomorphic to Conc(B) for any B in W. The bound aleph 2 is optimal. As a corollary of our results, there are continuum many congruence classes of locally finite varieties of (bounded) modular lattices.

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