Could someone remind me what theorem is this:(adsbygoogle = window.adsbygoogle || []).push({});

##let \ \phi: [0,1] \rightarrow \mathbb{R} \ , \ \phi \geqslant 0 \ , \ \phi \in \mathbb{R} \\[20pt]

if \ \ \int_0^1 \mathrm{\phi(t)} \ \mathrm{d}t = 0 \ \Rightarrow \ \phi \equiv 0##

Thanks

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# Theorem Reminder

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