Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
@MichaelRenardy I read somewhere that the correct interpretation might be $f \in H^{s/2}_x(H^{s/2}_y)$ by interpolation. If this is right, could you point to a reference? Is this interpolation result in Lions and Magenes?
