# How to show a set is convex?

Seeking a tip on show to show convexity in a set.

Allow $f\colon \mathbb{R}^n \rightarrow \mathbb{R}$ be a convex function and also allow $c$ be some constant.

Show that the set $s=\\{x \in \mathbb{R}^n \mid f(x) \le c \\}$ is convex.

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2019-05-13 03:20:00
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