List questions from open-map | MathQa

Are meromorphic functions open?

Published on 13 Jan 2025 - 9:30

Discontinuous surjective linear map which is not open

Published on 12 Jan 2025 - 21:23

$f:\mathbb R^2 \to \mathbb R$ be a function , $|f(x)-f(y)|\ge 3\|x-y\| , \forall x,y \in \mathbb R^2$ ; is $f(\mathbb R^2)$ open in $\mathbb R$?

Published on 12 Jan 2025 - 21:43

Proving these equivalent conditions for an open map using boundary of a set

Published on 12 Jan 2025 - 21:35

Proving the set $E(f) = \{(x,y,z)\in\mathbb{R}^3 \ | \ z > f(x,y) \}$ is open if $f$ is continuous.

Published on 12 Jan 2025 - 21:35

Sketch the open balls for the Railway Metric

Published on 12 Jan 2025 - 21:16

Proving $X$ is compact using a function $f\colon X \to Y$?

Published on 12 Jan 2025 - 22:37

Conditions for being an open map - check my proof

Published on 12 Jan 2025 - 21:19

"A continuous map which is open but not closed"-can someone explain to me why this proof works?

Published on 12 Jan 2025 - 21:39

Is the canonical projection $p_i\colon\operatorname{lim}X\to X(i)$ an open map?

Published on 12 Jan 2025 - 21:35