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Lattice (module) : ウィキペディア英語版
Lattice (module)
In mathematics, in the field of ring theory, a lattice is a module over a ring which is embedded in a vector space over a field, giving an algebraic generalisation of the way a lattice group is embedded in a real vector space.
==Formal definition==
Let ''R'' be an integral domain with field of fractions ''K''. An ''R''-module ''M'' is a ''lattice'' in the ''K''-vector space ''V'' if ''M'' is finitely generated, ''R''-torsion-free (no non-zero element of ''M'' is annihilated by a regular element of ''R'') and an ''R''-submodule of ''V''. It is ''full'' if ''V'' = ''K''·''M''.〔Reiner (2003) pp. 44, 108〕

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