Continuity of the data-to-solution map for the FORQ equation in Besov Spaces

Abstract: For Besov spaces $B^s_{p,r}(\rr)$ with $s>\max{ 2 + \frac1p , \frac52} $, $p \in (1,\infty]$ and $r \in [1 , \infty)$, it is proved that the data-to-solution map for the FORQ equation is not uniformly continuous from $B^s_{p,r}(\rr)$ to $C([0,T]; B^s_{p,r}(\rr))$. The proof of non-uniform dependence is based on approximate solutions and the Littlewood-Paley decomposition.