I need to find an orthonormal basis of $H^2(-N,N)$ where $N \in \mathbb{N}$ and $H^2$ denotes the Sobolev space $W^2_2$. I have no idea how to start. A hint to some literatur would be perfect.
2026-05-04 20:18:13.1777925893
How to find a basis of $H^2(-N,N)$?
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