Question

On nonconvex cones over compact convex sets in Hadamard spaces

score 592 · Answer 1 · 2026-04-15 08:13:48

592

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On nonconvex cones over compact convex sets in Hadamard spaces

Published on 15 Apr 2026 - 8:13

score 10.1k · Answer 2 · 2026-04-09 23:05:56

10.1k

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Does $\lim_{h\rightarrow 0}\ [f(x+h)-f(x-h)]=0$ imply that $f$ is continuous?

Published on 09 Apr 2026 - 23:05

score 37.3k · Answer 3 · 2026-04-09 23:20:23

37.3k

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Not every metric is induced from a norm

Published on 09 Apr 2026 - 23:20

score 3.5k · Answer 4 · 2026-04-15 06:40:37

3.5k

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The "zig-zag comb" weakly deformation retracts to the central zig-zag line

Published on 15 Apr 2026 - 6:40

score 978 · Answer 5 · 2026-04-16 10:37:47

978

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predicate logic - counterexample $(A \models \phi \implies A \models \psi) \implies A \models \phi \rightarrow \psi$

Published on 16 Apr 2026 - 10:37

score 195 · Answer 6 · 2026-04-13 10:14:01

195

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On $T_2$, first countable, countably compact space

Published on 13 Apr 2026 - 10:14

score 8.5k · Answer 7 · 2026-04-11 18:08:09

8.5k

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Need some help on a non-example of equicontinuity

Published on 11 Apr 2026 - 18:08

score 157 · Answer 8 · 2026-04-12 02:43:59

157

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A question about weakening the conditions of Schauder's fixed point theorem

Published on 12 Apr 2026 - 2:43

score 2.6k · Answer 9 · 2026-04-12 22:26:38

2.6k

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Intersection of countable set of compact sets

Published on 12 Apr 2026 - 22:26

score 1k · Answer 10 · 2026-04-09 20:31:31

1k

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Is the integral closure of a Henselian DVR $A$ in a finite extension of its field of fractions finite over $A$?

Published on 09 Apr 2026 - 20:31

score 585 · Answer 11 · 2026-04-11 18:07:00

585

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Is there a residually finite group not finitely presented?

Published on 11 Apr 2026 - 18:07

score 583 · Answer 12 · 2026-04-16 12:06:43

583

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If $V \times W$ with the product norm is complete, must $V$ and $W$ be complete?

Published on 16 Apr 2026 - 12:06

score 2.3k · Answer 13 · 2026-04-15 01:29:25

2.3k

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Some examples of virtually cyclic groups

Published on 15 Apr 2026 - 1:29

score 2.3k · Answer 14 · 2026-04-10 13:02:35

2.3k

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Can two topological spaces surject onto each other but not be homeomorphic?

Published on 10 Apr 2026 - 13:02

score 11.7k · Answer 15 · 2026-04-16 02:09:18

11.7k

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Do we have always $f(A \cap B) = f(A) \cap f(B)$?

Published on 16 Apr 2026 - 2:09

List Question

On nonconvex cones over compact convex sets in Hadamard spaces

Does $\lim_{h\rightarrow 0}\ [f(x+h)-f(x-h)]=0$ imply that $f$ is continuous?

Not every metric is induced from a norm

The "zig-zag comb" weakly deformation retracts to the central zig-zag line

predicate logic - counterexample $(A \models \phi \implies A \models \psi) \implies A \models \phi \rightarrow \psi$

On $T_2$, first countable, countably compact space

Need some help on a non-example of equicontinuity

A question about weakening the conditions of Schauder's fixed point theorem

Intersection of countable set of compact sets

Is the integral closure of a Henselian DVR $A$ in a finite extension of its field of fractions finite over $A$?

Is there a residually finite group not finitely presented?

If $V \times W$ with the product norm is complete, must $V$ and $W$ be complete?

Some examples of virtually cyclic groups

Can two topological spaces surject onto each other but not be homeomorphic?

Do we have always $f(A \cap B) = f(A) \cap f(B)$?

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