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Local Well-Posedness of the KdV Equation with Quasi-Periodic Initial Data
We prove the local well-posedness for the Cauchy problem of the Korteweg--de Vries equation in a quasi-periodic function space. The function space contains functions such that $f=f_1+f_2+\cdots+f_N$ where $f_j$ is in the Sobolev space of order $s>-1/2N$ of $2\pi\alpha^{-1}_j$ periodic functions. Note that $f$ is not a periodic function when …