Question

Solving general cubic without complicated substitutions

score 118 · Answer 1 · 2026-03-24 19:00:58

118

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Solving general cubic without complicated substitutions

Published on 24 Mar 2026 - 19:00

score 79 · Answer 2 · 2018-02-12 13:56:07

79

Views

if $u=3^{1/5}$ then $\mathbb Q(u)=\mathbb Q(u²)$

Published on 12 Feb 2018 - 13:56

score 40 · Answer 3 · 2026-03-26 01:16:37

40

Views

Does $F(w(x))\leqslant C_wF(x)$ for a certain constant $C_w$ with $F$ being a distance function?

Published on 26 Mar 2026 - 1:16

score 61 · Answer 4 · 2026-03-25 20:35:50

61

Views

How do we know the dimension of this vector space?

Published on 25 Mar 2026 - 20:35

score 325 · Answer 5 · 2026-03-26 16:05:17

325

Views

If $A$ and $B$ are square symmetric matrices and have same eigenvectors, do they commute?

Published on 26 Mar 2026 - 16:05

score 78 · Answer 6 · 2018-02-12 16:46:09

78

Views

Can $\max\{x\in X\}$ be written as $f(\sum_{x\in X}g(x))$ for some functions $f,g$.

Published on 12 Feb 2018 - 16:46

score 350 · Answer 7 · 2026-03-26 02:57:01

350

Views

Rank of Matrix equal over Q and R?

Published on 26 Mar 2026 - 2:57

score 231 · Answer 8 · 2026-03-24 22:08:30

231

Views

Work out the a rotation matrix in this condition

Published on 24 Mar 2026 - 22:08

score 110 · Answer 9 · 2018-02-12 19:00:22

110

Views

$a,b,c$ are digits. İf $a+2b+3c=40$ then what is the largest value for $a+b+c$?

Published on 12 Feb 2018 - 19:00

score 435 · Answer 10 · 2026-03-24 15:43:23

435

Views

If two different symmetric positive definite matrices have equal determinants then $A-B$ is neither positive semidefinite nor negative definite

Published on 24 Mar 2026 - 15:43

score 57 · Answer 11 · 2026-03-25 03:22:18

57

Views

Find $A^{-1}$ if $AB^TC = I_n$, where $A$, $B$, and $C$ are invertible $n \times n$ matrices

Published on 25 Mar 2026 - 3:22

score 15.4k · Answer 12 · 2026-03-27 01:37:46

15.4k

Views

Find Basis of Image of a Matrix

Published on 27 Mar 2026 - 1:37

score 483 · Answer 13 · 2026-03-23 08:29:22

483

Views

Some questions about a $3 \times 3 $ real skew-symmetric matrix

Published on 23 Mar 2026 - 8:29

score 98 · Answer 14 · 2026-03-26 16:06:29

98

Views

$\forall v\in V(v\neq 0 \implies \exists \lambda\in \mathbf{F}(Tv = \lambda v))\implies \exists k\in\mathbf{F}\forall v\in V(Tv = kv)$

Published on 26 Mar 2026 - 16:06

score 291 · Answer 15 · 2026-03-31 05:36:42

291

Views

Explicit formula for the adjoint of the derivation operation?

Published on 31 Mar 2026 - 5:36

List Question

Solving general cubic without complicated substitutions

if $u=3^{1/5}$ then $\mathbb Q(u)=\mathbb Q(u²)$

Does $F(w(x))\leqslant C_wF(x)$ for a certain constant $C_w$ with $F$ being a distance function?

How do we know the dimension of this vector space?

If $A$ and $B$ are square symmetric matrices and have same eigenvectors, do they commute?

Can $\max\{x\in X\}$ be written as $f(\sum_{x\in X}g(x))$ for some functions $f,g$.

Rank of Matrix equal over Q and R?

Work out the a rotation matrix in this condition

$a,b,c$ are digits. İf $a+2b+3c=40$ then what is the largest value for $a+b+c$?

If two different symmetric positive definite matrices have equal determinants then $A-B$ is neither positive semidefinite nor negative definite

Find $A^{-1}$ if $AB^TC = I_n$, where $A$, $B$, and $C$ are invertible $n \times n$ matrices

Find Basis of Image of a Matrix

Some questions about a $3 \times 3 $ real skew-symmetric matrix

$\forall v\in V(v\neq 0 \implies \exists \lambda\in \mathbf{F}(Tv = \lambda v))\implies \exists k\in\mathbf{F}\forall v\in V(Tv = kv)$

Explicit formula for the adjoint of the derivation operation?

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