Automorphic Forms and the Picard Number of an Elliptic Surface - Aspects of Mathematics - Peter Stiller - Libros - Springer Fachmedien Wiesbaden - 9783322907103 - 10 de noviembre de 2012
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Peter Stiller
Automorphic Forms and the Picard Number of an Elliptic Surface - Aspects of Mathematics Softcover reprint of the original 1st ed. 1984 edition

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In studying an algebraic surface E, which we assume is non-singular and projective over the field of complex numbers t, it is natural to study the curves on this surface. In order to do this one introduces various equivalence relations on the group of divisors (cycles of codimension one). One such relation is algebraic equivalence and we denote by NS(E) the group of divisors modulo algebraic equivalence which is called the N~ron-Severi group of the surface E. This is known to be a finitely generated abelian group which can be regarded naturally as a subgroup of 2 H (E, Z). The rank of NS(E) will be denoted p and is known as the Picard number of E. 2 Every divisor determines a cohomology class in H(E, E) which is of I type (1,1), that is to say a class in H(E,9!) which can be viewed as a 2 subspace of H(E, E) via the Hodge decomposition. The Hodge Conjecture asserts in general that every rational cohomology class of type (p, p) is algebraic. In our case this is the Lefschetz Theorem on (I, l)-classes: Every cohomology class 2 2 is the class associated to some divisor. Here we are writing H (E, Z) for 2 its image under the natural mapping into H (E, t). Thus NS(E) modulo 2 torsion is Hl(E, n!) n H(E, Z) and th 1 b i f h -~ p measures e a ge ra c part 0 t e cohomology.

194 pages, biography

Medios de comunicación Libros     Paperback Book   (Libro con tapa blanda y lomo encolado)
Publicado 10 de noviembre de 2012
Fecha de lanzamiento original 1984
ISBN13 9783322907103
Editores Springer Fachmedien Wiesbaden
Páginas 194
Dimensiones 155 × 235 × 10 mm   ·   290 g
Lengua Inglés  

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