Question

The sum of the present ages of a mother and her son is $42$. What was the mother's age $15$ years ago before her son was born?

score 112 · Answer 1 · 2018-03-13 13:54:07

The sum of the present ages of a mother and her son is $42$. What was the mother's age $15$ years ago before her son was born?

score 77 · Answer 2 · 2026-03-25 18:47:30

77

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Asymptotic behavior of the geometric sequence $U_{n+1}=QU_n$ in a probability problem

Published on 25 Mar 2026 - 18:47

score 53 · Answer 3 · 2026-03-27 14:10:26

53

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(asymmetric, transitive) "upstream" relation using matrix representation: how to check completeness of matrix (basic quality check)

Published on 27 Mar 2026 - 14:10

score 546 · Answer 4 · 2026-04-06 02:39:21

546

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How to construct negative definite $AB$ if $A$ and $B$ are positive definite?

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score 608 · Answer 5 · 2018-03-13 14:41:34

608

Views

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Published on 13 Mar 2018 - 14:41

score 669 · Answer 6 · 2026-04-05 18:54:39

669

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score 222 · Answer 7 · 2026-04-01 09:58:09

222

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Frobenius matrix norm inequality

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score 73 · Answer 8 · 2026-03-27 15:16:44

73

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Relation between eigenvalues and the characteristic polynomial of a matrix

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score 4.1k · Answer 9 · 2026-04-06 04:18:48

4.1k

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Proving that matrix is similar to its transpose

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score 458 · Answer 10 · 2026-04-02 01:05:49

458

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Use the method of separation of variables to separate the differential equation into 3 ordinary differential equations.

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score 216 · Answer 11 · 2026-04-06 04:16:13

216

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how to define a function over a Jordanizable matrix

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score 37 · Answer 12 · 2026-03-27 15:18:05

37

Views

Show that $A^TW_0+W_0A=-C^TC$

Published on 27 Mar 2026 - 15:18

score 744 · Answer 13 · 2026-03-26 19:03:08

744

Views

If $v$, $w$, and $v + w$ are nonzero, and $v$ and $v + w$ parallel, then $v$ and $w$ are parallel.

Published on 26 Mar 2026 - 19:03

score 735 · Answer 14 · 2026-04-06 04:16:30

735

Views

Construct example - $A$ and $B$ have strictly positive eigenvalues, but $A+B$ and $AB$ have strictly negative eigenvalues.

Published on 06 Apr 2026 - 4:16

score 86 · Answer 15 · 2026-03-25 01:16:17

86

Views

Projection of a Matrix onto another one's column space

Published on 25 Mar 2026 - 1:16

List Question

The sum of the present ages of a mother and her son is $42$. What was the mother's age $15$ years ago before her son was born?

Asymptotic behavior of the geometric sequence $U_{n+1}=QU_n$ in a probability problem

(asymmetric, transitive) "upstream" relation using matrix representation: how to check completeness of matrix (basic quality check)

How to construct negative definite $AB$ if $A$ and $B$ are positive definite?

Finding the annihilator of polynomials that span a space

Kernel and isomorphism

Frobenius matrix norm inequality

Relation between eigenvalues and the characteristic polynomial of a matrix

Proving that matrix is similar to its transpose

Use the method of separation of variables to separate the differential equation into 3 ordinary differential equations.

how to define a function over a Jordanizable matrix

Show that $A^TW_0+W_0A=-C^TC$

If $v$, $w$, and $v + w$ are nonzero, and $v$ and $v + w$ parallel, then $v$ and $w$ are parallel.

Construct example - $A$ and $B$ have strictly positive eigenvalues, but $A+B$ and $AB$ have strictly negative eigenvalues.

Projection of a Matrix onto another one's column space

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