List questions from alternative-proof

Published on 18 Jul 2015 - 16:52

158

Views

Is my proof of 'inscribed angle theorem' different from the usual one?

Published on 22 Jul 2015 - 13:01

339

Views

Why is periodic harmonic analysis only possible with sines?

Published on 22 Jul 2015 - 21:40

80

Views

Prove that $H\times K \cong K\times H$

Published on 24 Jul 2015 - 21:11

48

Views

Asymptote criterion

Published on 24 Jul 2015 - 22:18

6.2k

Views

Prove that $\sum_{d|n}\phi(d)=n$ where $\phi$ is the Euler's phi function, $n,c\in\mathbb{N}$

Published on 29 Mar 2026 - 7:28

880

Views

A finite set and the set of its fixed points under any involution have cardinalities of the same parity

Published on 25 Jul 2015 - 16:37

2.8k

Views

Prove that if $a<1/a<b<1/b$ then $a<-1$

Published on 26 Jul 2015 - 11:42

116

Views

What exactly is $\cap$-stable here?

Published on 28 Mar 2026 - 20:03

6.9k

Views

$S$ and $T$ are two sets. Prove that if $|S-T|=|T-S|$, then $|S|=|T|$.

Published on 03 Apr 2026 - 14:51

135

Views

Help with proof: $\mathrm{rank}(A+B) \le \mathrm{rank}(A) + \mathrm{rank}(B)$

Published on 27 Jul 2015 - 19:30

3.5k

Views

Use proof by contradiction to prove that if $a$ and $b$ are odd integers, then $4 \nmid (a^2+b^2)$.

Published on 28 Jul 2015 - 5:58

1.2k

Views

Abel-Ruffini theorem, Galois theory and minima and maxima

Published on 07 Apr 2026 - 3:18

200

Views

Hypercenter is the intersection of normalizers of Sylow subgroups.

Published on 28 Jul 2015 - 17:59

122

Views

Solving the trigonometric equation $\tan^2x+\cot^2x=2-\cos^{2014}(2x)$

Published on 29 Jul 2015 - 12:36

List Question

Possible alternative way of expressing continuity of a function?

Is my proof of 'inscribed angle theorem' different from the usual one?

Why is periodic harmonic analysis only possible with sines?

Prove that $H\times K \cong K\times H$

Asymptote criterion

Prove that $\sum_{d|n}\phi(d)=n$ where $\phi$ is the Euler's phi function, $n,c\in\mathbb{N}$

A finite set and the set of its fixed points under any involution have cardinalities of the same parity

Prove that if $a<1/a<b<1/b$ then $a<-1$

What exactly is $\cap$-stable here?

$S$ and $T$ are two sets. Prove that if $|S-T|=|T-S|$, then $|S|=|T|$.

Help with proof: $\mathrm{rank}(A+B) \le \mathrm{rank}(A) + \mathrm{rank}(B)$

Use proof by contradiction to prove that if $a$ and $b$ are odd integers, then $4 \nmid (a^2+b^2)$.

Abel-Ruffini theorem, Galois theory and minima and maxima

Hypercenter is the intersection of normalizers of Sylow subgroups.

Solving the trigonometric equation $\tan^2x+\cot^2x=2-\cos^{2014}(2x)$

Trending Questions

Popular # Hahtags

Popular Questions