Download e-book for kindle: Algebraic Geometry: Proceedings of the U. S.-U. S. S. R. by Spencer J. Bloch, I. Dolgachev, W. Fulton

By Spencer J. Bloch, I. Dolgachev, W. Fulton

ISBN-10: 0387544569

ISBN-13: 9780387544564

This quantity includes the complaints of a joint USA-USSR symposium on algebraic geometry, held in Chicago, united states, in June-July 1989.

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Extra info for Algebraic Geometry: Proceedings of the U. S.-U. S. S. R. Symposium Held in Chicago, June 20-July 14, 1989

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The equality takes place if and only if CEI2Fi[ for some i. Note that. in the above notation, Fi+mE tFi+Kst. , 10. W e denote by gi the plane containing the curve F i. It is easy to see, by using the previous Corollary, that dim]k-Fi-Fjl = 0 if i C j, hence the planes ~ a n d gj span a hyperplane and therefore intersect at one point. I,emma 2. rqc~S = F i. PROOF. The linear system ]A-Fil is cut out by hyperplanes passing through the plane rq. Therefore our assertion follows f r o m the fact that IzX-Fil has no base points.

L. Ein, The irreducibility of the Hilbert scheme of smooth space curves, Proc. Syrup. Pure Math. 46 (1987), pp. 83-87 25 [EKS] D. Eisenbud, J. Koh and M. StiUman, Determinantal equations for curves of high degree, Am. J. Math. II0 (1988), pp. 513-539. [G]. M. Green, Koszul cohomology and the geometry of projective varieties, I, J. Diff. Geom 19_9(1984), pp. 125-171. [GLI. M. Green and R. Lazarsfeld, On the projective normality of complete linear series on an algebraic curve, Inv. Math. 83, pF. :)3 - ~o [Griff].

Varieties. strata of on X, ~:X Let Let and X-Y. we have isomorphism n n n x = n[X,y ) Y ~ be = Proof. One where r proof to the different from and let assume when ~. e. that Y'=YUX r. toric of that isomorphism T T . is an affine of some faces of Suppose T'= TU{r}, 0 T=a~, and we ie q=0 that consists case subwariety { can r~T be a proper Suppose - ~ C 0 a closed Then AP(Mc) ~ n(x,y ). > X -l(y). Rq~*~P(x'Y) Y=UX isomorphism ~. Similar pre-image exact of toric variety, 0 By X for the over sequence we holds on the dimension morphism can assume ~.

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Algebraic Geometry: Proceedings of the U. S.-U. S. S. R. Symposium Held in Chicago, June 20-July 14, 1989 by Spencer J. Bloch, I. Dolgachev, W. Fulton


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