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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 :: It can be proved by defining a homomorphism with and in degree 1, surjective in degrees and checking that locally on the ''n'' + 1 standard charts the kernel is isomorphic to the relative differential module.〔Theorem II.8.13 in 〕
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