Absolute CM-periods by Hiroyuki Yoshida

By Hiroyuki Yoshida

The valuable topic of this booklet is an invariant connected to an excellent classification of a wholly genuine algebraic quantity box. This invariant offers us with a unified realizing of sessions of abelian forms with advanced multiplication and the Stark-Shintani devices. it is a new perspective, and the ebook includes many new effects relating to it. to put those ends up in right viewpoint and to provide instruments to assault unsolved difficulties, the writer offers systematic expositions of primary themes. hence the ebook treats the a number of gamma functionality, the Stark conjecture, Shimura's interval image, absolutely the interval image, Eisenstein sequence on $GL(2)$, and a restrict formulation of Kronecker's style. The dialogue of every of those themes is stronger via many examples. nearly all of the textual content is written assuming a few familiarity with algebraic quantity conception. approximately thirty difficulties are integrated, a few of that are fairly tough. The booklet is meant for graduate scholars and researchers operating in quantity conception and automorphic kinds

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For a generalization of this formula see Exercise 2. 6) Corollary. Proof. {J~(v {J~ +'x) is a canonical theta function for L for every = aL(w,v W E K(L). 3 a)) = e(2niE(w,'x) )aL('x, v){J~(v) = aL('x,v){J~(v) . (since wE A(L)) 0 The set of theta functions {J~ corresponding to a suitably chosen subset of K (L) forms a basis of HO (L ). This is the contents of the following theorem, the main result of this section. 7) Theorem. Suppose L = L(H, X) is a positive definite line bundle on X and let c be a characteristic with respect to a decomposition V = VI Eli V2 for L.

It will play an important role in the theory of theta groups and Heisenberg groups in Chapter 6. Section 3 reduces the case of a positive semidefinite line bundle to a positive definite § 1 Characteristics 47 one. Section 4 contains the proof of the Vanishing Theorem of Mumford and Kempf. The remaining step in the computation of the cohomology groups, the above mentioned trick of Wirtinger, can be found in Section 5. Finally in Section 6 we deduce various forms of the Riemann-Roch Theorem. In Section 4 we use Dolbeault's Theorem for the cohomology groups of a holomorphic line bundle as well as Serre duality.

The converse implication is obvious. 0 Another application of the Poincare bundle is the following criterion for a homomorphism f: X ---; X to be of the form

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