Question

Is the local connectedness heritable over the connected subspaces?

score 127 · Answer 1 · 2026-04-11 10:51:44

127

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Is the local connectedness heritable over the connected subspaces?

Published on 11 Apr 2026 - 10:51

score 219 · Answer 2 · 2026-04-12 13:32:33

219

Views

Differentiable but not absolutely continuous cumulative distribution function

Published on 12 Apr 2026 - 13:32

score 67 · Answer 3 · 2026-04-13 12:55:53

67

Views

Power automorphism

Published on 13 Apr 2026 - 12:55

score 107 · Answer 4 · 2026-04-15 05:57:59

107

Views

Examples of non-complete lattices with enough prime elements

Published on 15 Apr 2026 - 5:57

score 41 · Answer 5 · 2026-04-16 03:20:34

41

Views

examples of functions analytic only in strip (0,1) and with natural boundaries Re(z)=0,1?

Published on 16 Apr 2026 - 3:20

score 124 · Answer 6 · 2026-04-12 22:53:30

124

Views

Counterexample of Borsuk-Ulam theorem (Discontinuous Functions)

Published on 12 Apr 2026 - 22:53

score 302 · Answer 7 · 2026-04-15 03:45:46

302

Views

A continuous function from $\Bbb Q$ into $\Bbb Q$ which is never a rational function

Published on 15 Apr 2026 - 3:45

score 320 · Answer 8 · 2026-04-09 08:04:42

320

Views

Finite-Dimensional Homogeneous Contractible Spaces

Published on 09 Apr 2026 - 8:04

score 22 · Answer 9 · 2026-04-15 18:40:24

22

Views

Example of a ring satisfying Euclid's lemma, but with no gcd and/or lcm.

Published on 15 Apr 2026 - 18:40

score 46 · Answer 10 · 2026-04-16 00:29:52

46

Views

If $\sum_{n=0}^{\infty}a_n$ converges so $\sum_{n=0}^{\infty}a_n^2 $ too($(a_n)$ sequence of real numbers)

Published on 16 Apr 2026 - 0:29

score 107 · Answer 11 · 2026-04-13 16:45:36

107

Views

If $K, K' \subset \mathbb{S}^2$ are compact and $K \simeq K'$, is $\mathbb{S}^2 \setminus K \simeq \mathbb{S}^2 \setminus K'$?

Published on 13 Apr 2026 - 16:45

score 58 · Answer 12 · 2026-04-15 08:20:07

58

Views

If $\sum_{n=0}^{\infty}a_n$ et $\sum_{n=0}^{\infty}|b_n|$ converge, so $\sum_{n=0}^{\infty}a_nb_n$ as well.

Published on 15 Apr 2026 - 8:20

score 85 · Answer 13 · 2026-04-13 06:14:30

85

Views

Is a non-differentiable function convex near a strict minimum?

Published on 13 Apr 2026 - 6:14

score 403 · Answer 14 · 2026-04-12 07:59:59

403

Views

Is a bounded function in $H^1(\Omega)$ also continuous for a Lipschitz domain $\Omega \subset \mathbb R^2$?

Published on 12 Apr 2026 - 7:59

score 49 · Answer 15 · 2026-04-16 03:54:13

49

Views

Give a counterexample showing that there exist two different matrices $X$ and $Y$ such that $X\cdot A=I_n=Y\cdot A$

Published on 16 Apr 2026 - 3:54

List Question

Is the local connectedness heritable over the connected subspaces?

Differentiable but not absolutely continuous cumulative distribution function

Power automorphism

Examples of non-complete lattices with enough prime elements

examples of functions analytic only in strip (0,1) and with natural boundaries Re(z)=0,1?

Counterexample of Borsuk-Ulam theorem (Discontinuous Functions)

A continuous function from $\Bbb Q$ into $\Bbb Q$ which is never a rational function

Finite-Dimensional Homogeneous Contractible Spaces

Example of a ring satisfying Euclid's lemma, but with no gcd and/or lcm.

If $\sum_{n=0}^{\infty}a_n$ converges so $\sum_{n=0}^{\infty}a_n^2 $ too($(a_n)$ sequence of real numbers)

If $K, K' \subset \mathbb{S}^2$ are compact and $K \simeq K'$, is $\mathbb{S}^2 \setminus K \simeq \mathbb{S}^2 \setminus K'$?

If $\sum_{n=0}^{\infty}a_n$ et $\sum_{n=0}^{\infty}|b_n|$ converge, so $\sum_{n=0}^{\infty}a_nb_n$ as well.

Is a non-differentiable function convex near a strict minimum?

Is a bounded function in $H^1(\Omega)$ also continuous for a Lipschitz domain $\Omega \subset \mathbb R^2$?

Give a counterexample showing that there exist two different matrices $X$ and $Y$ such that $X\cdot A=I_n=Y\cdot A$

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