Abstract
We formulate the inverse scattering method for a periodic box–ball system and solve the initial value problem. It is done by a synthesis of the combinatorial Bethe ansatzes at q = 1 and q = 0 , which provides the ultradiscrete analogue of quasi-periodic solutions in soliton equations, e.g., action–angle variables, Jacobi varieties, period matrices and so forth. As an application we establish explicit formulas counting the states characterized by conserved quantities and the generic and fundamental period under the commuting family of time evolutions.
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