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Varieties of Lattices with Geometric Descriptions

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Abstract

A lattice L is spatial if every element of L is a join of completely join-irreducible elements of L (points), and strongly spatial if it is spatial and the minimal coverings of completely join-irreducible elements are well-behaved. Herrmann et al. proved in 1994 that every modular lattice can be embedded, within its variety, into an algebraic and spatial lattice. We extend this result to n-distributive lattices, for fixed n. We deduce that the variety of all n-distributive lattices is generated by its finite members, thus it has a decidable word problem for free lattices. This solves two problems stated by Huhn in 1985. We prove that every modular (resp., n-distributive) lattice embeds within its variety into some strongly spatial lattice. Every lattice which is either algebraic modular spatial or bi-algebraic is strongly spatial. We also construct a lattice that cannot be embedded, within its variety, into any algebraic and spatial lattice. This lattice has a least and a largest element, and it generates a locally finite variety of join-semidistributive lattices.

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Correspondence to Friedrich Wehrung.

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Both authors were partially supported by the PEPS project TRECOLOCOCO.

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Santocanale, L., Wehrung, F. Varieties of Lattices with Geometric Descriptions. Order 30, 13–38 (2013). https://doi.org/10.1007/s11083-011-9225-1

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