List questions from alternative-proof

Published on 19 Mar 2014 - 13:22

1.5k

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Proof: Each common divisor c of a,b divides GCD(a,b)

Published on 27 Mar 2026 - 10:44

4.8k

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Proof of the ‘second’ triangle inequality

Published on 27 Mar 2026 - 2:50

3.6k

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Combinatorics proof of "sum of (k choose m) with k from m up to n is equal to n+1 choose m+1"

Published on 25 Mar 2014 - 20:01

248

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Last decimal digit of any perfect square must be $0,1,4,5,6$ or $9$

Published on 26 Mar 2014 - 4:06

59

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Proof that 6 divides $a \in \mathbb{Z}, a(a^2 - 7)$

Published on 27 Mar 2014 - 4:51

75

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Computing a field extension by hand

Published on 27 Mar 2014 - 21:47

123

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If one of the hypotheses holds, then one of the conclusions holds. (looking for a proof)

Published on 28 Mar 2014 - 8:06

229

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Alternative Proof for "Roots of Mertens Function-Farey Sequence-Cosines Relations"

Published on 23 Mar 2026 - 6:13

208

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A simpler way to prove $\frac{\tan A}{1-\cot A}+ \frac{\cot A}{1-\tan A}=\sec A \csc A + 1$?

Published on 03 Apr 2014 - 23:40

113

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Solving a divisibility problem using group theory

Published on 03 Apr 2014 - 23:42

104

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I have a question about groups of finite order.

Published on 04 Apr 2014 - 6:02

39

Views

Can someone explain me how to read members of a set to prove uncountability?

Published on 04 Apr 2014 - 15:07

425

Views

Cool property of the number $24$

Published on 05 Apr 2014 - 23:23

146

Views

Direct understanding of vector projection

Published on 06 Apr 2014 - 19:25

List Question

Easy proof for sum of squares $\approx n^3/3$

Proof: Each common divisor c of a,b divides GCD(a,b)

Proof of the ‘second’ triangle inequality

Combinatorics proof of "sum of (k choose m) with k from m up to n is equal to n+1 choose m+1"

Last decimal digit of any perfect square must be $0,1,4,5,6$ or $9$

Proof that 6 divides $a \in \mathbb{Z}, a(a^2 - 7)$

Computing a field extension by hand

If one of the hypotheses holds, then one of the conclusions holds. (looking for a proof)

Alternative Proof for "Roots of Mertens Function-Farey Sequence-Cosines Relations"

A simpler way to prove $\frac{\tan A}{1-\cot A}+ \frac{\cot A}{1-\tan A}=\sec A \csc A + 1$?

Solving a divisibility problem using group theory

I have a question about groups of finite order.

Can someone explain me how to read members of a set to prove uncountability?

Cool property of the number $24$

Direct understanding of vector projection

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