If there exists a power series $\displaystyle\sum_{n=0}^{+\infty}a_nx^n$ whose radius of convergence is 1, and $\forall k\in \mathbb {N}, \displaystyle\sum_{n=0}^{+\infty}(a_nx^n)^{(k)} $ (namely the k-th term-by-term derivation) converges at the point $x=1$?
Furthermore, if the above eample exists, dose that mean for this example the convergence property is also satisfied with $x=-1$?
2026-05-05 17:40:09.1778002809
Construction of a special power series
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