i have a question please. What's the necessary and sufficient condition of the sequences $(a_n)$ for $\sum_{n \in \mathbb{N}^\star} a_n \varphi(\frac{1}{n})$ be finite? When $\varphi \in C^\infty_c(\mathbb{R})$?
2026-04-08 02:28:02.1775615282
condition to define an distribution
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