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The theory of lattices in the sense of order theory. For the number-theoretic notion, use the tag "lattices" instead.

5 votes
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Do any Stone-like dualities have some self-dualities hidden inside them?

any infinite abelian group acquires some canonical non-discrete topology in this way, what is this topology? The maximal precompact topology (used to define almost-periodic functions). See secti …
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2 votes
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Minimal (semi)lattice containing a given poset

Gratzer's book (2011 edition) about lattice has details about the existence of the (semi)lattice freely generated by a poset $P$ in a given (quasi)variety of (semi)lattices (possibly with suitable ad …
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25 votes

Was lattice theory central to mid-20th century mathematics?

For the "simpler question": yes, in the decade 1930-1940 the (not many) pioneers of lattice theory had big hopes; one can read their hopes in the Bulletin AMS of 1938 for the first symposium in latti …
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7 votes

Type III factor representation

A characterization of projection ortholattices of von Neumann algebras (and more generally JBW algebras) with no type I$_2$ component was given by Bunce and J.D.M. Wright in two papers: [1] and [2] (f …
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2 votes

A non-orthomodular orthocomplemented lattice identity?

You are interested in a ortholattice identity in two variables. Now, the word problem for free ortholattices and free orthomodular lattices is solvable; hence you can apply these algorithms to obtain …
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2 votes

Are there atomistic ortholattices which are not modular?

Examples are contained in a classical book about semimodular lattice theory: F. Maeda and S. Maeda "theory of symmetric lattices". See that book for details and refernces concerning what follows. Let …
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