Lyubeznik numbers of projective schemes

preprint2011arXivOpen access

Abstract

Let XX be a projective scheme over a field kk and let AA be the local ring at the vertex of the affine cone of XX under some embedding X↪PknX\hookrightarrow\mathbb{P}^n_k. We prove that, when ch⁡(k)>0\ch(k)>0, the Lyubeznik numbers λi,j(A)λ_{i,j}(A) are intrinsic numerical invariants of XX, i.e., λi,j(A)λ_{i,j}(A) depend only on XX, but not on the embedding.

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