List questions from examples-counterexamples

Published on 22 Dec 2016 - 14:21

108

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Example of homeomorphic-conjugate maps that is not $C^1$

Published on 22 Dec 2016 - 18:15

4.3k

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What is an example of infinite dimensional subspace that is not closed?

Published on 22 Dec 2016 - 23:55

1.6k

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Fields that can be ordered in more than one way

Published on 25 Mar 2026 - 23:08

284

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positive maps on $C^*$-algebras which are not 2-positive

Published on 01 Apr 2026 - 9:52

367

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Non-locally factorial domain

Published on 28 Mar 2026 - 10:34

163

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What's about the Frullani extension for infinite series?

Published on 25 Dec 2016 - 3:01

78

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Examples of functions f(x,y)

Published on 25 Dec 2016 - 14:51

197

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4-manifold with $w_1\neq 0$, $w_1^2=0$, $w_2\neq 0$

Published on 25 Mar 2026 - 6:35

250

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Counterexample of converse of "if $f: A\to B$ and $g: B\to C$ are surjective, then $g\circ f$ is surjective"

Published on 26 Dec 2016 - 13:38

7.2k

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Examples of closed sets with empty interior

Published on 29 Mar 2026 - 10:27

55

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Find a positive definite matrix with $a_{1,1}<0$

Published on 28 Mar 2026 - 18:01

409

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Examples of "non-topological" convergence

Published on 29 Dec 2016 - 12:32

111

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Counter-example for a tensor equality.

Published on 29 Dec 2016 - 14:50

42

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Analogue of Brunnian braids in other fields of mathematics?

Published on 25 Mar 2026 - 7:44

List Question

continuous surjective functions from $(a,b$] to $(a,b)$

Example of homeomorphic-conjugate maps that is not $C^1$

What is an example of infinite dimensional subspace that is not closed?

Fields that can be ordered in more than one way

positive maps on $C^*$-algebras which are not 2-positive

Non-locally factorial domain

What's about the Frullani extension for infinite series?

Examples of functions f(x,y)

4-manifold with $w_1\neq 0$, $w_1^2=0$, $w_2\neq 0$

Counterexample of converse of "if $f: A\to B$ and $g: B\to C$ are surjective, then $g\circ f$ is surjective"

Examples of closed sets with empty interior

Find a positive definite matrix with $a_{1,1}<0$

Examples of "non-topological" convergence

Counter-example for a tensor equality.

Analogue of Brunnian braids in other fields of mathematics?

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