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I would like to prove that for a LSC function, its epigraph is closed. I saw some longer proof here, but why would the following not hold ? :

$f LSC := \liminf f(x_n) \ge f(x)$ when $x_n \rightarrow x$

then $x_n,a_n \rightarrow x,a \implies f(x) \le \liminf f(x_n) \le \liminf a_n = a$

so $x,a \in epi(f)$

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This is a streamlined version of the proof in wikipedia. Perhaps it's a bit too streamlined (write it up using quantifiers!). Otherwise it appears perfectly valid to me.

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  • $\begingroup$ yeah, i spotted other weird stuff in the article in reference. not to be taken as a reference ! $\endgroup$ – nicolas Dec 31 '12 at 17:44

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