List questions from closed-graph | MathQA

How to show a correspondence is lower-hemicontinous?

Published on 23 Feb 2026 - 6:01

Example for closed proper convex function

Published on 25 Mar 2026 - 23:16

Is the graph of $x \mapsto \arg \min_{u \in U} f(x, u)$ closed?

Published on 23 Feb 2026 - 6:05

Converse of closed graph theorem

Published on 20 Nov 2022 - 12:14

Show $A=\{ (x,y)\in \mathbb R \mid xy=1 \}$ is closed in $\mathbb R^2.$

Published on 14 Dec 2022 - 11:51

Prove that any eigenspace of an operator T ∈ C(X ) is closed.

Published on 30 Dec 2022 - 5:52

How can I show that $f\mapsto f'$ is a closed map?

Published on 27 Jan 2023 - 14:07