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Sheaf of modules : ウィキペディア英語版
Sheaf of modules
In mathematics, a sheaf of ''O''-modules or simply an ''O''-module over a ringed space (''X'', ''O'') is a sheaf ''F'' such that, for any open subset ''U'' of ''X'', ''F''(''U'') is an ''O''(''U'')-module and the restriction maps ''F''(''U'') →''F''(''V'') are compatible with the restriction maps ''O''(''U'') →''O''(''V''): the restriction of ''fs'' is the restriction of ''f'' times that of ''s'' for any ''f'' in ''O''(''U'') and ''s'' in ''F''(''U'').
The standard case is when ''X'' is a scheme and ''O'' its structure sheaf. If ''O'' is the constant sheaf \underline^i(X, -) as the ''i''-th right derived functor of the global section functor \Gamma(X, -).〔This cohomology functor coincides with the right derived functor of the global section functor in the category of abelian sheaves; cf. 〕
== Examples ==

*If ''F'' is an ''O''-module, then an ''O''-submodule of ''F'' is called the ideal or ideal sheaf of ''O''.
*Let ''X'' be a smooth variety of dimension ''n''. Then the tangent sheaf of ''X'' is the dual of the cotangent sheaf \Omega_X and the canonical sheaf \omega_X is the ''n''-th exterior power (determinant) of \Omega_X.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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