Question

Group with every finite order elements

score 266 · Answer 1 · 2023-05-28 05:49:32

266

Views

Group with every finite order elements

Published on 28 May 2023 - 5:49

score 104 · Answer 2 · 2023-05-29 04:05:34

104

Views

Can the pre-image of a non-measurable subset of $[0,1]$ under the function $f:[0,1]\to[0,1]$, where the range of $f$ is $[0,1]$, be measurable?

Published on 29 May 2023 - 4:05

score 83 · Answer 3 · 2026-03-26 12:50:11

83

Views

Is the extension of a torsion free group by a torsion free group necessarily torsion free?

Published on 26 Mar 2026 - 12:50

score 87 · Answer 4 · 2026-03-28 14:44:11

87

Views

Explicit enumerations of n-tuples of naturals $f:\mathbb{N}^n \to \mathbb{N}$?

Published on 28 Mar 2026 - 14:44

score 221 · Answer 5 · 2026-04-01 14:41:27

221

Views

A non-Riemann integrable function that is Lebesgue integrable

Published on 01 Apr 2026 - 14:41

score 86 · Answer 6 · 2023-06-03 14:25:05

86

Views

A Ring with Rank Condition that doesn't satisfy Strong Rank Condition

Published on 03 Jun 2023 - 14:25

score 72 · Answer 7 · 2026-03-28 01:08:35

72

Views

If $f:X→X$ is a bijection then is $g(x):=\begin{cases}f(x),\,\text{if }x∈Y\\x,\,\text{otherwise}\end{cases}$ with $Y∈\mathcal P(X)$ a bijection too?

Published on 28 Mar 2026 - 1:08

score 49 · Answer 8 · 2026-04-03 06:56:59

49

Views

If $⊥$ is an operation on $X$ inversely compatibile at $x$ in $X$ with the order $\mathcal O$ on $X$ then is it directly compatible at $x$ too?

Published on 03 Apr 2026 - 6:56

score 108 · Answer 9 · 2026-03-25 16:13:52

108

Views

Is the stronger form of Dirichlet's theorem on arithmetic progressions strong enough to prove Goldbach's (asymptotic) conjecture?

Published on 25 Mar 2026 - 16:13

score 147 · Answer 10 · 2026-03-26 16:26:13

147

Views

How is a full and faithful functor necessarily injective on objects up to isomorphism?

Published on 26 Mar 2026 - 16:26

score 189 · Answer 11 · 2026-03-25 23:44:00

189

Views

Particular solution of Schrodinger equation, satisfying time dependent boundary conditions

Published on 25 Mar 2026 - 23:44

score 78 · Answer 12 · 2023-06-19 20:23:25

78

Views

Counterexample: locally compact non-Hausdorff space where open sets are sigma-compact and compact sets are closed?

Published on 19 Jun 2023 - 20:23

score 121 · Answer 13 · 2026-02-25 02:28:12

121

Views

Examples of spaces where compact convergence is not equivalent to local uniform convergence.

Published on 25 Feb 2026 - 2:28

score 55 · Answer 14 · 2023-06-23 02:37:28

55

Views

If $g \in (\mathbb{Z}/n\mathbb{Z})^\times$ then $\displaystyle \sum_{i=0}^{\lambda \cdot k-1} g^i \equiv 0 \pmod{n}$

Published on 23 Jun 2023 - 2:37

score 447 · Answer 15 · 2023-06-23 23:15:30

447

Views

Good examples of tensor products for beginners.

Published on 23 Jun 2023 - 23:15

List Question

Group with every finite order elements

Can the pre-image of a non-measurable subset of $[0,1]$ under the function $f:[0,1]\to[0,1]$, where the range of $f$ is $[0,1]$, be measurable?

Is the extension of a torsion free group by a torsion free group necessarily torsion free?

Explicit enumerations of n-tuples of naturals $f:\mathbb{N}^n \to \mathbb{N}$?

A non-Riemann integrable function that is Lebesgue integrable

A Ring with Rank Condition that doesn't satisfy Strong Rank Condition

If $f:X→X$ is a bijection then is $g(x):=\begin{cases}f(x),\,\text{if }x∈Y\\x,\,\text{otherwise}\end{cases}$ with $Y∈\mathcal P(X)$ a bijection too?

If $⊥$ is an operation on $X$ inversely compatibile at $x$ in $X$ with the order $\mathcal O$ on $X$ then is it directly compatible at $x$ too?

Is the stronger form of Dirichlet's theorem on arithmetic progressions strong enough to prove Goldbach's (asymptotic) conjecture?

How is a full and faithful functor necessarily injective on objects up to isomorphism?

Particular solution of Schrodinger equation, satisfying time dependent boundary conditions

Counterexample: locally compact non-Hausdorff space where open sets are sigma-compact and compact sets are closed?

Examples of spaces where compact convergence is not equivalent to local uniform convergence.

If $g \in (\mathbb{Z}/n\mathbb{Z})^\times$ then $\displaystyle \sum_{i=0}^{\lambda \cdot k-1} g^i \equiv 0 \pmod{n}$

Good examples of tensor products for beginners.

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