I thought that the lemma
Lemma: Let $f \in L^1_{loc}$. Assume that for all $\phi \in \mathscr{D}$, $\int f\phi = 0$. Then $f = 0$.
had been given the name of a famous mathematician, but I can't remember. How do you call this lemma?
2026-04-18 18:22:51.1776536571
What is the name of the following lemma?
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