List questions from systems-of-equations

Published on 09 Apr 2026 - 10:40

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A pair of coupled second order linear ODEs. Where is my mistake?

Published on 26 Oct 2019 - 13:50

115

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Find the minimum of :$P=a+b+c-ab-bc-ca$

Published on 31 Mar 2026 - 17:02

46

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How to solve for $3$ constants with $3$ equations

Published on 11 Apr 2026 - 7:08

36

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Find x+y+z if $x^2+xy+y^2=a^2$, $y^2+yz+z^2=b^2$ and $z^2+zx+x^2=c^2$

Published on 26 Mar 2026 - 22:55

48

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Digit problem $a,b$

Published on 12 Apr 2026 - 18:30

135

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System of nonlinear second order ODEs - Elimination Method

Published on 27 Mar 2026 - 8:40

1.1k

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Complex number in a 3x3 matrix

Published on 27 Oct 2019 - 21:21

141

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Lorenz system for $s=10$, $r=28$ and $b=8/3$ has unstable critical points, but they never go out of the butterfly shape

Published on 28 Oct 2019 - 7:23

168

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If positive reals $a, b, c$ satisfy $a=\frac{b+1}{c-1}, b=\frac{c-1}{a-1}$ and $c=\frac{a-1}{b+1}$, then does $a-b+c=4$ hold?

Published on 28 Oct 2019 - 12:40

80

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some questions in a paper by E. H. Neville (1949) about Farey series?

Published on 07 Apr 2026 - 7:22

73

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Proof that there are no cubes with all verteces on a certain class of surfaces

Published on 11 Apr 2026 - 22:20

145

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Expressing the solution to a quadratic matrix equation

Published on 10 Apr 2026 - 22:53

105

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Finding solution to $Xa=b$ where $X$ has to be symmetric positive-definite

Published on 10 Apr 2026 - 13:14

58

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How to solve linear system with sparse large matrix?

Published on 25 Mar 2026 - 7:50

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Confusion about linear system

A pair of coupled second order linear ODEs. Where is my mistake?

Find the minimum of :$P=a+b+c-ab-bc-ca$

How to solve for $3$ constants with $3$ equations

Find x+y+z if $x^2+xy+y^2=a^2$, $y^2+yz+z^2=b^2$ and $z^2+zx+x^2=c^2$

Digit problem $a,b$

System of nonlinear second order ODEs - Elimination Method

Complex number in a 3x3 matrix

Lorenz system for $s=10$, $r=28$ and $b=8/3$ has unstable critical points, but they never go out of the butterfly shape

If positive reals $a, b, c$ satisfy $a=\frac{b+1}{c-1}, b=\frac{c-1}{a-1}$ and $c=\frac{a-1}{b+1}$, then does $a-b+c=4$ hold?

some questions in a paper by E. H. Neville (1949) about Farey series?

Proof that there are no cubes with all verteces on a certain class of surfaces

Expressing the solution to a quadratic matrix equation

Finding solution to $Xa=b$ where $X$ has to be symmetric positive-definite

How to solve linear system with sparse large matrix?

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