Lectures on Algebraic Geometry I, 2nd Edition: Sheaves, - download pdf or read online

By Günter Harder

ISBN-10: 3834818445

ISBN-13: 9783834818447

This booklet and the subsequent moment quantity is an creation into glossy algebraic geometry. within the first quantity the equipment of homological algebra, concept of sheaves, and sheaf cohomology are built. those tools are quintessential for contemporary algebraic geometry, yet also they are primary for different branches of arithmetic and of serious curiosity of their personal. within the final bankruptcy of quantity I those strategies are utilized to the idea of compact Riemann surfaces. during this bankruptcy the writer makes transparent how influential the tips of Abel, Riemann and Jacobi have been and that a few of the glossy equipment were expected via them. For this moment version the textual content was once thoroughly revised and corrected. the writer additionally further a brief part on moduli of elliptic curves with N-level buildings. This new paragraph anticipates many of the suggestions of quantity II.

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Get Lectures on Algebraic Geometry I, 2nd Edition: Sheaves, PDF

This booklet and the subsequent moment quantity is an creation into sleek algebraic geometry. within the first quantity the equipment of homological algebra, concept of sheaves, and sheaf cohomology are constructed. those equipment are necessary for contemporary algebraic geometry, yet also they are primary for different branches of arithmetic and of significant curiosity of their personal.

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Additional info for Lectures on Algebraic Geometry I, 2nd Edition: Sheaves, Cohomology of Sheaves, and Applications to Riemann Surfaces

Sample text

0 .............................................. ......... .... .. HomR (P0 ,M ) .................... HomR (P0 ,I 0 ) ................... HomR (P0 ,I 1 ) ................................................ . . .. ... .... 0 ................................................. ......... ... ... . .......... ... ... .. .. ... ... HomR (N,M ) ...................... HomR (N,I 0 ) ....................... HomR (N,I 1 ) ................................................. . . .. ..

M ........................................... 0 ... .... ... .. .. . N .......................................... N .......................................... N ........................................... e. all diagrams commute). ˇ 1 (Γ,M ). We pick an element In principle we can try to extend our sequence beyond H 1 1 ˇ ˇ in H (Γ,M ) and try to lift it to an element in H (Γ,M ), and then we will see what the obstruction to this lifting will be. This will suggest a definition of a cohomology group ˇ 2 (Γ,M ).

1 1 1 ........................................... .............. 20) ... But by construction these groups R ExtiR (N,M ) are also functorial in N if we fix M , the functors N −→ R Exti (N,M ) are contravariant. Analogously we choose a projective resolution P• −→ N −→ 0 and define L Ext•R (N,M ) = H• (HomR (P• ,M )).

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Lectures on Algebraic Geometry I, 2nd Edition: Sheaves, Cohomology of Sheaves, and Applications to Riemann Surfaces by Günter Harder


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