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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 f: R \to S, 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'',
*f_! M = M \otimes_R S, the induced module.
*f_
* M = \operatorname_R(S, M), the coinduced module.
*f^
* N = N_R, the restriction of scalars.
They are related as adjoint functors:
:f_! : \text_R \leftrightarrows \text_S : f^
*
and
:f^
* : \text_S \leftrightarrows \text_R : f_
*.
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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