Integrable equations, addition theorems, and the Riemann–Schottky problem

V. M. Buchstaber   ; I. M. Krichever

Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 61 (2006) no. 1, pp. 19-78

Résumé

The classical Weierstrass theorem claims that, among the analytic functions, the only functions admitting an algebraic addition theorem are the elliptic functions and their degenerations. This survey is devoted to far-reaching generalizations of this result that are motivated by the theory of integrable systems. The authors discovered a strong form of the addition theorem for theta functions of Jacobian varieties, and this form led to new approaches to known problems in the geometry of Abelian varieties. It is shown that strong forms of addition theorems arise naturally in the theory of the so-called trilinear functional equations. Diverse aspects of the approaches suggested here are discussed, and some important open problems are formulated.

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