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Generalized Gaudin models and Riccatians

Aleksander Ushveridze — 1996

Banach Center Publications

The systems of differential equations whose solutions exactly coincide with Bethe ansatz solutions for generalized Gaudin models are constructed. These equations are called the generalized spectral ( 1 ) Riccati equations, because the simplest equation of this class has a standard Riccatian form. The general form of these equations is R n i [ z 1 ( λ ) , . . . , z r ( λ ) ] = c n i ( λ ) , i=1,..., r, where R n i denote some homogeneous polynomials of degrees n i constructed from functional variables z i ( λ ) and their derivatives. It is assumed that d e g k z i ( λ ) = k + 1 . The problem...

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