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$(x-\epsilon,x+\epsilon)$ is not a subset of $o$. are the only two $x \in o$ s.t.
that $$\inf(a) = -\sup(-a)$$ my attempt at a proof: given that $$a \subset \mathbb{r}... real-analysis supremum-and-infimum solution-verification asked jan at : zeta gold badge silver badges bronze badges votes answers views proving infimum and supremum of a set find the supremum and infimum of the...
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