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math.FA2014
Interpolation of nonlinear maps
T. Kappeler, A. Savchuk, A. Shkalikov +1
Let and be complex Banach couples and assume that with norms satisfying for some . For any $0<θ<1…
math.FA2007
On the symplectic phase space of KdV
T. Kappeler, F. Serier, P. Topalov
We prove that the Birkhoff map $\Om$ for KdV constructed on $H^{-1}_0(\T)$ can be interpolated between $H^{-1}_0(\T)$ and $L^2_0(\T)$. In particular, the symplectic phase space $H^…