Lattices freely generated by posets within a variety. Part II: Finitely generated varieties

Details Lattices freely generated by posets within a variety. Part II: Finitely generated varieties Lattices freely generated by posets within a variety. Part II: Finitely generated varieties

2010-07-09

arxiv.org/abs/1007.1643v1

Mathematics

Combinatorics

22 pages, 94 figures

Scientific paper

This article is the second part of an essay dedicated to lattices freely generated by posets within a variety. The first part dealt with four easy varieties while this part is concerned with finitely generated varieties. Here we present a method of constructing a subdirect product L of a finite family F of finite lattices, exploiting a set of special elements of L deducted from F. This method is applied to free lattices generated by posets within finitely generated varieties, where in the case of the variety of modular lattices, we elaborate an efficient algorithm to compute the modular lattice M freely generated by a poset. For some posets of order six, the cardinality of M is listed.

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