List questions from solution-verification

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Prove that $(A\vec{x})\cdot (A\vec{y})=\vec{x}\cdot \vec{y}$ if $\|A\vec{x}\|=\|\vec{x}\| \ \forall\vec{x}$

Published on 06 May 2019 - 14:18

357

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Example of an equation that generates solutions?

Published on 24 Mar 2026 - 23:43

153

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Graph with expansion of $K_5$ has subgraph which is expansion of $K_{3,3}$.

Published on 13 May 2019 - 19:09

81

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Confusing regarding a nested radical equation

Published on 24 Mar 2026 - 23:40

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GRE geometry question: Determining whether one area is greater or equal to another

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A nasty indefinite integral $ \int \frac{1}{x(x+1)(x+2)(x+3)(x+4) ... (x+m)} dx $

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Problem 3, chapter 2 Rudin functional analysis

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304

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Find a generator for ideal $(a,b)$ in an euclidean domain [Euclidean $\Rightarrow$ PID]

Published on 21 May 2019 - 1:26

991

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Center of the dihedral group with odd and even number of vertices

Published on 25 May 2019 - 3:36

382

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Regression on trivariate data with one coefficient 0

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177

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Finding subfields with Galois group of order 20

Published on 28 May 2019 - 0:35

873

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$x \equiv a \pmod{\!n}\iff x \equiv a\,$ or $\, a + n \pmod{\!2n}$

Published on 28 May 2019 - 19:00

879

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Twice-differentiable function such that $f(\frac{1}{n})=0$ for every positive integer $n$.

Published on 06 Jun 2019 - 12:28

112

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Does this formula derived from the Cauchy-Riemann differential equations have a name?

Published on 25 Mar 2026 - 11:19

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Lie algebra homomorphisms preserve semi-simplicity?

Prove that $(A\vec{x})\cdot (A\vec{y})=\vec{x}\cdot \vec{y}$ if $\|A\vec{x}\|=\|\vec{x}\| \ \forall\vec{x}$

Example of an equation that generates solutions?

Graph with expansion of $K_5$ has subgraph which is expansion of $K_{3,3}$.

Confusing regarding a nested radical equation

GRE geometry question: Determining whether one area is greater or equal to another

A nasty indefinite integral $ \int \frac{1}{x(x+1)(x+2)(x+3)(x+4) ... (x+m)} dx $

Problem 3, chapter 2 Rudin functional analysis

Find a generator for ideal $(a,b)$ in an euclidean domain [Euclidean $\Rightarrow$ PID]

Center of the dihedral group with odd and even number of vertices

Regression on trivariate data with one coefficient 0

Finding subfields with Galois group of order 20

$x \equiv a \pmod{\!n}\iff x \equiv a\,$ or $\, a + n \pmod{\!2n}$

Twice-differentiable function such that $f(\frac{1}{n})=0$ for every positive integer $n$.

Does this formula derived from the Cauchy-Riemann differential equations have a name?

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