China
Based on the theory of tetragonal curves, we obtain algebro-geometric quasi-periodic solutions for a discrete coupled KdV (DCKdV) hierarchy, which arises from coupled five-point lattice equations. Starting from a discrete matrix spectral problem, the DCKdV hierarchy is generated via the zero-curvature equation. The associated spectral curve is a tetragonal curve and can be compactified as the four-sheeted compact Riemann surface, on which we define a Baker-Akhiezer function and study its analytical properties. Using the Abel map and Abelian differentials, all nonlinear flows of the hierarchy are linearized under Abel-Jacobi coordinates. This leads to the explicit Riemann theta function representations for the meromorphic and Baker-Akhiezer functions, thereby also obtaining the algebro-geometric quasi-periodic solutions of the DCKdV hierarchy. The work extends the finite-gap integration technique to the discrete coupled system with the Lax pair.
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