Question

Integration of one-form

score 356 · Answer 1 · 2026-05-04 18:40:44

356

Views

Integration of one-form

Published on 04 May 2026 - 18:40

score 83 · Answer 2 · 2026-05-02 18:42:20

83

Views

Proof verification : Assume $A$ is a $n×m$ matrix, and $B$ is $m×n$. Prove that $AB$, an $n×n$ matrix is not invertible, if $n>m$.

Published on 02 May 2026 - 18:42

score 742 · Answer 3 · 2026-05-02 20:03:46

742

Views

A possible proof of Brocard’s Problem?

Published on 02 May 2026 - 20:03

score 612 · Answer 4 · 2026-04-29 12:42:50

612

Views

If $H$ and $K$ are solvable subgroups of $G$ with $H\unlhd G $ then $HK$ is a solvable subgroup of $G .$

Published on 29 Apr 2026 - 12:42

score 70 · Answer 5 · 2026-04-13 23:10:33

70

Views

Proof-check: If two sequences are $\varepsilon$-close, then the first one is bounded if and only if the second is bounded too

Published on 13 Apr 2026 - 23:10

score 110 · Answer 6 · 2026-05-07 20:33:57

110

Views

About the definition of a presheaf in SGA4

Published on 07 May 2026 - 20:33

score 510 · Answer 7 · 2026-05-07 07:35:56

510

Views

Help with proof or counterexample: $A^3=0 \implies I_n+A$ is invertible

Published on 07 May 2026 - 7:35

score 34 · Answer 8 · 2026-04-13 10:02:04

34

Views

Restricting scalars from complex to real in explicit matrix computation

Published on 13 Apr 2026 - 10:02

score 403 · Answer 9 · 2026-05-05 03:50:08

403

Views

The Martian Monetary System

Published on 05 May 2026 - 3:50

score 50 · Answer 10 · 2026-04-16 11:57:07

50

Views

Are there at least 17 different bases in which $(1,2,3)$ can be expressed as $(1,1,1)$?

Published on 16 Apr 2026 - 11:57

score 1k · Answer 11 · 2026-05-05 02:03:14

1k

Views

Cantor-Bernstein-Schröder Theorem: small proof using Graph Theory, is this correct?

Published on 05 May 2026 - 2:03

score 972 · Answer 12 · 2026-04-29 12:24:55

972

Views

Proving the one-point compactification of a topological space is a topology

Published on 29 Apr 2026 - 12:24

score 280 · Answer 13 · 2026-05-07 19:15:35

280

Views

How does positive (semi)definiteness help with showing convexity of quadratic forms?

Published on 07 May 2026 - 19:15

score 351 · Answer 14 · 2026-04-29 12:25:11

351

Views

Is it possible to convert a conjunction of two implications into an implication of disjunctions?

Published on 29 Apr 2026 - 12:25

score 37 · Answer 15 · 2026-05-10 11:42:49

37

Views

Prove that $\forall\{x, y, z\}\subset\Bbb{Z}, \ \big(x+\frac{z}{2(x-y)}\big)^2-\big(y+\frac{z}{2(x-y)}\big)^2\in\Bbb{Z}$

Published on 10 May 2026 - 11:42

List Question

Integration of one-form

Proof verification : Assume $A$ is a $n×m$ matrix, and $B$ is $m×n$. Prove that $AB$, an $n×n$ matrix is not invertible, if $n>m$.

A possible proof of Brocard’s Problem?

If $H$ and $K$ are solvable subgroups of $G$ with $H\unlhd G $ then $HK$ is a solvable subgroup of $G .$

Proof-check: If two sequences are $\varepsilon$-close, then the first one is bounded if and only if the second is bounded too

About the definition of a presheaf in SGA4

Help with proof or counterexample: $A^3=0 \implies I_n+A$ is invertible

Restricting scalars from complex to real in explicit matrix computation

The Martian Monetary System

Are there at least 17 different bases in which $(1,2,3)$ can be expressed as $(1,1,1)$?

Cantor-Bernstein-Schröder Theorem: small proof using Graph Theory, is this correct?

Proving the one-point compactification of a topological space is a topology

How does positive (semi)definiteness help with showing convexity of quadratic forms?

Is it possible to convert a conjunction of two implications into an implication of disjunctions?

Prove that $\forall\{x, y, z\}\subset\Bbb{Z}, \ \big(x+\frac{z}{2(x-y)}\big)^2-\big(y+\frac{z}{2(x-y)}\big)^2\in\Bbb{Z}$

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