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Euler sequence
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Euler sequence : ウィキペディア英語版
Euler sequence
In mathematics, the Euler sequence is a particular exact sequence of sheaves on ''n''-dimensional projective space over a ring. It shows that the sheaf of relative differentials is stably isomorphic to an (''n'' + 1)-fold sum of the dual of the Serre twisting sheaf.
== Statement ==
For ''A'' a ring, there is an exact sequence of sheaves
:: 0 \to \Omega^1_ \to \mathcal_(-1)^ \to \mathcal_ \to 0.
It can be proved by defining a homomorphism S(-1)^ \to S, e_i \mapsto x_i with S = A() and e_i = 1 in degree 1, surjective in degrees \geq 1 and checking that locally on the ''n'' + 1 standard charts the kernel is isomorphic to the relative differential module.〔Theorem II.8.13 in 〕

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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