Abstract
In this work we investigate unique continuation properties of solutions to the initial value problem associated to the Benjamin–Ono equation in weighted Sobolev spaces $$Z_{s,r}=H^s(\mathbb R )\cap L^2(|x|^{2r}dx)$$ for $$s\in \mathbb R $$ , and $$s\ge 1$$ , $$s\ge r$$ . More precisely, we prove that the uniqueness property based on a decay requirement at three times can not be lowered to two times even by imposing stronger decay on the initial data.
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