Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
2005-05-02
Nonlinear Sciences
Exactly Solvable and Integrable Systems
latex2e, use amssymb and amsmath packages, contribution to proceedings of RIMS workshop "Elliptic Integrable Systems" (RIMS, 2
Scientific paper
Commuting pairs of ordinary differential operators are classified by a set of algebro-geometric data called ``algebraic spectral data''. These data consist of an algebraic curve (``spectral curve'') $\Gamma$ with a marked point $\gamma_\infty$, a holomorphic vector bundle $E$ on $\Gamma$ and some additional data related to the local structure of $\Gamma$ and $E$ in a neighborhood of $\gamma_\infty$. If the rank $r$ of $E$ is greater than 1, one can use the so called ``Tyurin parameters'' in place of $E$ itself. The Tyurin parameters specify the pole structure of a basis of joint eigenfunctions of the commuting pair. These data can be translated to the language of an infinite dimensional Grassmann manifold. This leads to a dynamical system of the standard exponential flows on the Grassmann manifold, in which the role of Tyurin parameters and some other parameters is made clear.
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