Question

A non-normal non-domain such that all localizations at all maximal ideals are normal domains

score 66 · Answer 1 · 2023-08-27 15:05:08

66

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A non-normal non-domain such that all localizations at all maximal ideals are normal domains

Published on 27 Aug 2023 - 15:05

score 47 · Answer 2 · 2026-04-06 13:00:56

47

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Is possibile to prove the equality $\left(⋃_{X∈\mathfrak X}X\right)×\left(⋃_{Y\in\mathfrak Y}Y\right)=⋃_{(X,Y)∈\mathfrak X×Y}(X×Y)$ using projections?

Published on 06 Apr 2026 - 13:00

score 94 · Answer 3 · 2023-08-31 18:19:12

94

Views

Differentiable function with differentiable inverse must be continuously differentiable?

Published on 31 Aug 2023 - 18:19

score 62 · Answer 4 · 2026-02-23 06:20:56

62

Views

Example of isometry between reflexive and non-reflexive Banach spaces

Published on 23 Feb 2026 - 6:20

score 92 · Answer 5 · 2023-09-03 14:21:22

92

Views

What is the smallest number of edges in a graph with $20$ vertices for which it is true that any subgraph on $5$ vertices of this graph is connected.

Published on 03 Sep 2023 - 14:21

score 283 · Answer 6 · 2026-03-31 15:08:55

283

Views

Suppose $\sum \frac{1}{a_n} $ diverges. Then does $\sum \frac{1}{n\Delta a_n}\ $ diverge?

Published on 31 Mar 2026 - 15:08

score 62 · Answer 7 · 2026-03-27 15:59:38

62

Views

Every line integral starting and ending at the boundary vanishes implies that the vector field is $0$?

Published on 27 Mar 2026 - 15:59

score 127 · Answer 8 · 2023-09-04 22:01:48

127

Views

If $\varphi : X\times Y\rightarrow Z$ is continuous, $\widehat{\varphi} : X\rightarrow C(Y,Z)$ is not necessary continuous.

Published on 04 Sep 2023 - 22:01

score 219 · Answer 9 · 2026-04-03 02:34:17

219

Views

What are the counter examples books for Abstract algebra?

Published on 03 Apr 2026 - 2:34

score 89 · Answer 10 · 2026-04-03 16:26:57

89

Views

There exists a definition of order homomorphism?

Published on 03 Apr 2026 - 16:26

score 325 · Answer 11 · 2026-03-29 16:55:58

325

Views

Counterexample in topos theory

Published on 29 Mar 2026 - 16:55

score 41 · Answer 12 · 2023-09-08 13:31:40

41

Views

Relation between topological and measurable subspaces

Published on 08 Sep 2023 - 13:31

score 46 · Answer 13 · 2023-09-11 09:02:28

Counter-example to the proposition that for any $\alpha>0,$ every large subset of natural numbers has a convex subsequence that sums to $\alpha.$

score 49 · Answer 14 · 2023-09-13 07:48:10

49

Views

Difference of convex functions with many oscillations (looking for examples)

Published on 13 Sep 2023 - 7:48

score 58 · Answer 15 · 2023-09-13 14:57:37

58

Views

Give an example in which two events exhibit conditional independence with an event B but not with B complement.

Published on 13 Sep 2023 - 14:57

List Question

A non-normal non-domain such that all localizations at all maximal ideals are normal domains

Is possibile to prove the equality $\left(⋃_{X∈\mathfrak X}X\right)×\left(⋃_{Y\in\mathfrak Y}Y\right)=⋃_{(X,Y)∈\mathfrak X×Y}(X×Y)$ using projections?

Differentiable function with differentiable inverse must be continuously differentiable?

Example of isometry between reflexive and non-reflexive Banach spaces

What is the smallest number of edges in a graph with $20$ vertices for which it is true that any subgraph on $5$ vertices of this graph is connected.

Suppose $\sum \frac{1}{a_n} $ diverges. Then does $\sum \frac{1}{n\Delta a_n}\ $ diverge?

Every line integral starting and ending at the boundary vanishes implies that the vector field is $0$?

If $\varphi : X\times Y\rightarrow Z$ is continuous, $\widehat{\varphi} : X\rightarrow C(Y,Z)$ is not necessary continuous.

What are the counter examples books for Abstract algebra?

There exists a definition of order homomorphism?

Counterexample in topos theory

Relation between topological and measurable subspaces

Counter-example to the proposition that for any $\alpha>0,$ every large subset of natural numbers has a convex subsequence that sums to $\alpha.$

Difference of convex functions with many oscillations (looking for examples)

Give an example in which two events exhibit conditional independence with an event B but not with B complement.

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