List questions from alternative-proof

Published on 12 Feb 2019 - 18:55

21

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Surjectivity of composition of functions

Published on 12 Feb 2019 - 22:04

40

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Verification of alternative proof of $\lim_{p\to \infty}\|u\|_p=\|u\|_\infty$

Published on 13 Feb 2019 - 1:09

293

Views

Validity of Using Induction to Show Union of an Infinite Ascending Chain of Subgroups is a Subgroup

Published on 13 Feb 2019 - 13:14

945

Views

Proving $(ab)^{-1} = a^{-1}b^{-1}$, if $a,b\ne 0$

Published on 14 Feb 2019 - 4:41

43

Views

Alternate proof for a problem using logic

Published on 14 Feb 2019 - 19:37

371

Views

If |x + y| > |x - y|, then how to arrive at $xy > 0$?

Published on 26 Mar 2026 - 14:31

3k

Views

Direct proof of Archimedean Property (not by contradiction)

Published on 16 Feb 2019 - 17:10

169

Views

Proof of separability of polynomials without derivatives

Published on 23 Feb 2026 - 1:20

63

Views

Show that $a_{k-1}a_{k+1}\le a_k^2$ where $P(x) = \sum_{k=0}^n a_k X^k$ is a real polynomial with real roots, and $0<k<n$

Published on 17 Feb 2019 - 10:25

201

Views

Multiple proofs of $\sum_{d|n}{\phi(d)}=n$

Published on 26 Mar 2026 - 17:18

61

Views

Hilbert space $x-P(x)\in A^{\perp}\Rightarrow \|x-P(x)\|=d(x,A)$

Published on 18 Feb 2019 - 7:41

587

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Hilbert Space: Orthogonal projection is linear

Published on 25 Mar 2026 - 19:24

216

Views

A single set of moves $S$ that, if repeated, solves the Rubik's cube from any state

Published on 25 Mar 2026 - 6:12

109

Views

Riesz representation theorem: show isometry

Published on 25 Mar 2026 - 8:05

List Question

Better proof for $x^3 + y^3 = (x+y)(x^2 - xy + y^2)$

Surjectivity of composition of functions

Verification of alternative proof of $\lim_{p\to \infty}\|u\|_p=\|u\|_\infty$

Validity of Using Induction to Show Union of an Infinite Ascending Chain of Subgroups is a Subgroup

Proving $(ab)^{-1} = a^{-1}b^{-1}$, if $a,b\ne 0$

Alternate proof for a problem using logic

If |x + y| > |x - y|, then how to arrive at $xy > 0$?

Direct proof of Archimedean Property (not by contradiction)

Proof of separability of polynomials without derivatives

Show that $a_{k-1}a_{k+1}\le a_k^2$ where $P(x) = \sum_{k=0}^n a_k X^k$ is a real polynomial with real roots, and $0<k<n$

Multiple proofs of $\sum_{d|n}{\phi(d)}=n$

Hilbert space $x-P(x)\in A^{\perp}\Rightarrow \|x-P(x)\|=d(x,A)$

Hilbert Space: Orthogonal projection is linear

A single set of moves $S$ that, if repeated, solves the Rubik's cube from any state

Riesz representation theorem: show isometry

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