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$L^p$-convergence of truncated Legendre series approximation to inverse error function $\tex...

Bounding the $L^p$-error for an $n$-th order Legendre series approximation I have function $f\,\colon (-1, 1) \to \mathbb{R}$ where $f \in L^q(-1, 1)$ for any $q \geq 1$. I approximate $f$ using a tru …