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Change of rings : ウィキペディア英語版 | Change of rings
In algebra, given a ring homomorphism , there are three ways to change the coefficient ring of a module; namely, for a right ''R''-module ''M'' and a right ''S''-module ''N'', *, the induced module. *, the coinduced module. *, the restriction of scalars. They are related as adjoint functors: : and : This is related to Shapiro's lemma. ==Restriction of scalars== Restriction of scalars changes ''S''-modules into ''R''-modules. In algebraic geometry, the term "restriction of scalars" is often used as a synonym for Weil restriction.
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