Cascante, Ma. Carme (Maria Carme)Ortega Aramburu, Joaquín M.2023-02-082023-02-0820200308-2105https://hdl.handle.net/2445/193250In this paper we characterize the boundedness on the product of Sobolev spaces $H^s(\mathbb{T}) \times H^s(\mathbb{T})$ on the unit circle $\mathbb{T}$, of the bilinear form $\Lambda_b$ with symbol $b \in H^s(\mathbb{T})$ given by $$ \Lambda_b(\varphi, \psi):=\int_{\mathbb{T}}\left((-\Delta)^s+I\right)(\varphi \psi)(\eta) b(\eta) d \sigma(\eta)$$38 p.application/pdfeng(c) Royal Society of Edinburgh , 2020Equacions en derivades parcialsTeoria del potencial (Matemàtica)Anàlisi funcionalEspais de SobolevPartial differential equationsPotential theory (Mathematics)Functional analysisSobolev spacesinfo:eu-repo/semantics/article6892672023-02-08info:eu-repo/semantics/openAccess