List questions from examples-counterexamples

Published on 12 Apr 2026 - 7:26

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Topological groups on the circle $S^1$

Published on 14 Apr 2026 - 17:37

142

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Minimum on all the lines is local minimum for $C^1$ functions?

Published on 15 Apr 2026 - 12:56

101

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Find $X_n$ and $X$, $X_n \xrightarrow{\text{d}} X$ with $X_n$ integrable but $X$ not.

Published on 17 Apr 2026 - 6:30

328

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Two claims about compositorials

Published on 08 Apr 2026 - 19:43

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What is an example of an oriented simplicial complex?

Published on 11 Apr 2026 - 17:36

307

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True or False: Fenchel dual $f^*$ is strictly convex if and only if $f$ is strictly concave?

Published on 16 Apr 2026 - 15:06

146

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Counter example for Laurent series

Published on 14 Apr 2026 - 7:17

823

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Looking for counter-examples in Collatz-like sequences

Published on 29 Mar 2026 - 8:14

168

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Generators and relations of an abelian group?

Published on 17 Apr 2026 - 22:16

49

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Example of a set that does not have the local product property and an extra property

Published on 16 Apr 2026 - 4:18

403

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Semi-ring with isomorphic additive and multiplicative structure

Published on 12 Apr 2026 - 3:30

88

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Why aren't norms used in the definition of Finsler manifolds?

Published on 09 Apr 2026 - 16:30

86

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why the space $I^{(2^C)}$ is not separable

Published on 12 Apr 2026 - 23:09

129

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Give me such a $"3n±Q"$ problem that we do not know a counter-example

Published on 29 Mar 2026 - 8:13

List Question

Conjectured primality test II

Topological groups on the circle $S^1$

Minimum on all the lines is local minimum for $C^1$ functions?

Find $X_n$ and $X$, $X_n \xrightarrow{\text{d}} X$ with $X_n$ integrable but $X$ not.

Two claims about compositorials

What is an example of an oriented simplicial complex?

True or False: Fenchel dual $f^*$ is strictly convex if and only if $f$ is strictly concave?

Counter example for Laurent series

Looking for counter-examples in Collatz-like sequences

Generators and relations of an abelian group?

Example of a set that does not have the local product property and an extra property

Semi-ring with isomorphic additive and multiplicative structure

Why aren't norms used in the definition of Finsler manifolds?

why the space $I^{(2^C)}$ is not separable

Give me such a $"3n±Q"$ problem that we do not know a counter-example

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