By Piotr Pragacz

ISBN-10: 3764385367

ISBN-13: 9783764385361

Articles study the contributions of the good mathematician J. M. Hoene-Wronski. even if a lot of his paintings was once pushed aside in the course of his lifetime, it truly is now well-known that his paintings deals beneficial perception into the character of arithmetic. The booklet starts off with elementary-level discussions and ends with discussions of present examine. many of the fabric hasn't ever been released sooner than, providing clean views on Hoene-Wronski’s contributions.

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Math. Ann. 314 (1999) 245–263. , Ongay, F. Nonemptiness of BrillNoether loci. Intern. J. Math. 11 (2000), 737–760. -M. Faisceaux coh´erents sur les courbes multiples. Collectanea Mathematica 57, 2 (2006), 121–171. -M. AG/0605726. -M. D´eformations des extensions larges de faisceaux. Paciﬁc Journ. of Math. 220, 2 (2005), 201–297. [8] Godement, R. Th´ eorie des faisceaux. Actualit´es scientiﬁques et industrielles 1252, Hermann, Paris (1964). [9] Hartshorne, R. Algebraic Geometry. GTM 52, Springer-Verlag (1977).

We will give an example that shows that the converse is not true. Let n be a positive integer. Let Z be a ﬁnite subscheme of P2 such that h0 (OZ ) = n(n+1) , and IZ be its ideal sheaf. Then it follows easily from the Beilin2 son spectral sequence that Z is not contained in a curve of degree n − 1 if and only if there is an exact sequence 0 −→ O(−n − 1) ⊗ Cn −→ O(−n) ⊗ Cn+1 −→ IZ −→ 0. Let W = Hom(O(−n−1)⊗Cn , O(−n)⊗Cn+1 ). We consider the action of the reductive group G = SL(n)×SL(n+1) on P(W ), with the obvious linearization.

3. 2 that if deg(L) < 0 we have an exact sequence of abelian groups 0 / H 1 (Ln−1 ) / Pic(Cn ) rn / Pic(Cn−1 ) / 0, where rn is the restriction morphism. Let Pn ⊂ Pic(Cn ) be the subgroup consisting of line bundles whose restriction to C is OC . Then we have a ﬁltration of abelian groups O = G0 ⊂ G1 ⊂ · · · ⊂ Gn−1 = Pn such that Gi /Gi−1 H 1 (Li ) for 1 ≤ i ≤ n − 1. Here Gi is the subgroup of Pn of line bundles whose restriction to Cn−i is trivial. , to a ﬁnite-dimensional vector space. Moduli Spaces of Coherent Sheaves on Multiples Curves 35 3.

### Algebraic Cycles, Sheaves, Shtukas, and Moduli: Impanga Lecture Notes by Piotr Pragacz

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