List questions from alternative-proof

Published on 27 Mar 2026 - 4:18

225

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Are pictures legitimate as a proof in mathematics?

Published on 30 Mar 2026 - 18:01

93

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Simple proof that two sums either both converge or diverge

Published on 14 Jan 2020 - 16:16

756

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Alternative proof of the generalized associative law for groups

Published on 15 Jan 2020 - 6:22

110

Views

Calculate $\sum_1^{30}r^3 {30 \choose r}$

Published on 26 Mar 2026 - 20:40

96

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Prove E is an equivalence relation over $ℝ^2$

Published on 19 Jan 2020 - 22:17

103

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Some identity related to Euler's identity

Published on 25 Mar 2026 - 13:42

43

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Algebraic proof on the $0$ entries of the powers of a matrix with entries in $\{0,1\}$

Published on 20 Jan 2020 - 3:32

48

Views

Prove the identity $1(1!)+2(2!)+3(3!)+...+n(n!)=(n+1)!-1$ without using induction

Published on 20 Jan 2020 - 22:49

169

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Prove that $A^2=a_1^2+a_2^2-a_3^2-a_4^2$ for all integers $A$.

Published on 27 Mar 2026 - 9:48

88

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Show $A \cap (B-C) = (A \cap B) - (A \cap C)$ using an alternative proof

Published on 21 Jan 2020 - 20:21

111

Views

Resolving a gap in the Kernel proof of the Dirichlet Integral

Published on 26 Mar 2026 - 22:52

86

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The sum of $\langle Su,u\rangle$ over an orthonormal basis is a constant

Published on 22 Jan 2020 - 15:16

581

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Prove that a binary relation R over a set A is a strict order if and only if R is irreflexive and transitive

Published on 22 Jan 2020 - 21:32

111

Views

Maximum and Minimum Value on Disk (No Lagrange)

Published on 24 Jan 2020 - 8:56

List Question

Prove $\sum_{n=0}^\infty(-1)^n(\overline{H}_n-\ln2)^3=-\frac5{16}\zeta(3)$

Are pictures legitimate as a proof in mathematics?

Simple proof that two sums either both converge or diverge

Alternative proof of the generalized associative law for groups

Calculate $\sum_1^{30}r^3 {30 \choose r}$

Prove E is an equivalence relation over $ℝ^2$

Some identity related to Euler's identity

Algebraic proof on the $0$ entries of the powers of a matrix with entries in $\{0,1\}$

Prove the identity $1(1!)+2(2!)+3(3!)+...+n(n!)=(n+1)!-1$ without using induction

Prove that $A^2=a_1^2+a_2^2-a_3^2-a_4^2$ for all integers $A$.

Show $A \cap (B-C) = (A \cap B) - (A \cap C)$ using an alternative proof

Resolving a gap in the Kernel proof of the Dirichlet Integral

The sum of $\langle Su,u\rangle$ over an orthonormal basis is a constant

Prove that a binary relation R over a set A is a strict order if and only if R is irreflexive and transitive

Maximum and Minimum Value on Disk (No Lagrange)

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