Question

Integration of one-form

score 344 · Answer 1 · 2026-03-17 07:27:09

344

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Integration of one-form

Published on 17 Mar 2026 - 7:27

score 76 · Answer 2 · 2026-03-22 07:00:10

76

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 22 Mar 2026 - 7:00

score 731 · Answer 3 · 2026-03-20 02:50:39

731

Views

A possible proof of Brocard’s Problem?

Published on 20 Mar 2026 - 2:50

score 605 · Answer 4 · 2026-03-20 10:45:32

605

Views

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

Published on 20 Mar 2026 - 10:45

score 67 · Answer 5 · 2018-01-16 14:29:29

67

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 16 Jan 2018 - 14:29

score 98 · Answer 6 · 2026-03-22 18:10:13

98

Views

About the definition of a presheaf in SGA4

Published on 22 Mar 2026 - 18:10

score 502 · Answer 7 · 2026-03-21 10:54:19

502

Views

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

Published on 21 Mar 2026 - 10:54

score 31 · Answer 8 · 2018-01-16 18:11:48

31

Views

Restricting scalars from complex to real in explicit matrix computation

Published on 16 Jan 2018 - 18:11

score 392 · Answer 9 · 2026-03-21 22:38:11

392

Views

The Martian Monetary System

Published on 21 Mar 2026 - 22:38

score 47 · Answer 10 · 2018-01-16 19:40:47

47

Views

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

Published on 16 Jan 2018 - 19:40

score 1k · Answer 11 · 2026-03-21 05:11:17

1k

Views

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

Published on 21 Mar 2026 - 5:11

score 967 · Answer 12 · 2026-03-22 07:52:53

967

Views

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

Published on 22 Mar 2026 - 7:52

score 270 · Answer 13 · 2026-03-23 17:32:40

270

Views

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

Published on 23 Mar 2026 - 17:32

score 347 · Answer 14 · 2026-03-12 09:49:22

347

Views

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

Published on 12 Mar 2026 - 9:49

score 30 · Answer 15 · 2026-03-20 10:57:42

30

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 20 Mar 2026 - 10:57

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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