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Lattices as they are used in number theory. (Not to be confused with lattice theory or lattices as used in physics!)

This tag is ambiguous, so we recommend against its use. See http://meta.mathoverflow.net/a/1761/121

Questions with this tag tend to be about either partially ordered sets, or discrete subgroups of Lie groups, or finite rank free abelian groups equipped with a quadratic form.

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