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Finding minimal $\gamma$ that satisfies the integral equation

I have a function $f(z) \in [0,\infty]$ that satisfies $-1 < f(z) < 0$. I would like to find the minimal $\gamma$ that satisfies: $$ \int_0^{\gamma} f(z)dz = \log(1+f(0)).$$ Clearly, I cannot bound su …
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