Question

Elegant Solution or Cryptic Hint, depending on who's reading (given by David Ullrich)

score 50 · Answer 1 · 2019-11-06 23:43:01

50

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Elegant Solution or Cryptic Hint, depending on who's reading (given by David Ullrich)

Published on 06 Nov 2019 - 23:43

score 193 · Answer 2 · 2026-04-14 11:20:49

193

Views

Conjecture: any two sequences of polygonal numbers will share multiple terms between them

Published on 14 Apr 2026 - 11:20

score 396 · Answer 3 · 2026-04-10 19:30:26

396

Views

Heptadecagon Derivation

Published on 10 Apr 2026 - 19:30

score 71 · Answer 4 · 2026-03-27 17:06:09

71

Views

Show that $\frac{d}{dt}\Phi_{X_{1}}(0)=a$, then $\Phi_{X_{1}}(t)=1+(ia+o(1))t$ as $t\longrightarrow 0$.

Published on 27 Mar 2026 - 17:06

score 79 · Answer 5 · 2026-04-18 04:35:12

79

Views

The maverick nature of the sum of squares proof

Published on 18 Apr 2026 - 4:35

score 464 · Answer 6 · 2026-04-10 12:11:37

464

Views

Strategies for translating statements into formal logic language

Published on 10 Apr 2026 - 12:11

score 57 · Answer 7 · 2026-04-09 19:56:31

57

Views

Trouble understanding injection problem

Published on 09 Apr 2026 - 19:56

score 373 · Answer 8 · 2026-04-11 06:02:13

373

Views

Proof clarification: Slepian’s inequality

Published on 11 Apr 2026 - 6:02

score 74 · Answer 9 · 2026-04-12 20:25:54

74

Views

Confusing proof for $\sqrt{2}$ is irrational

Published on 12 Apr 2026 - 20:25

score 58 · Answer 10 · 2026-04-12 17:01:14

58

Views

Is the proof of Invariance of Domain in Dugundji wrong or i don't understand something?

Published on 12 Apr 2026 - 17:01

score 264 · Answer 11 · 2026-04-13 06:37:41

264

Views

Is this a discrepancy about the symmetry of second derivative?

Published on 13 Apr 2026 - 6:37

score 36 · Answer 12 · 2026-04-12 15:46:38

36

Views

How to modify this proof to the case $\partial^2 f$ is not continuous?

Published on 12 Apr 2026 - 15:46

score 52 · Answer 13 · 2026-04-12 05:34:53

52

Views

Why does it means to be that solutions of polynomial are symmetric?

Published on 12 Apr 2026 - 5:34

score 125 · Answer 14 · 2026-04-16 06:51:27

125

Views

Every number in the set $ M = \{1,2, \ldots ,2008\}$ is one of the three colors blue, yellow, red such that each color...

Published on 16 Apr 2026 - 6:51

score 108 · Answer 15 · 2026-04-17 00:57:34

How come $x \notin N \cup P$ becomes $(x \notin N \text{ and }x \notin P)$ and $x \notin N \cap P$ becomes $(x \notin N \text{ or }x \notin P)$?

List Question

Elegant Solution or Cryptic Hint, depending on who's reading (given by David Ullrich)

Conjecture: any two sequences of polygonal numbers will share multiple terms between them

Heptadecagon Derivation

Show that $\frac{d}{dt}\Phi_{X_{1}}(0)=a$, then $\Phi_{X_{1}}(t)=1+(ia+o(1))t$ as $t\longrightarrow 0$.

The maverick nature of the sum of squares proof

Strategies for translating statements into formal logic language

Trouble understanding injection problem

Proof clarification: Slepian’s inequality

Confusing proof for $\sqrt{2}$ is irrational

Is the proof of Invariance of Domain in Dugundji wrong or i don't understand something?

Is this a discrepancy about the symmetry of second derivative?

How to modify this proof to the case $\partial^2 f$ is not continuous?

Why does it means to be that solutions of polynomial are symmetric?

Every number in the set $ M = \{1,2, \ldots ,2008\}$ is one of the three colors blue, yellow, red such that each color...

How come $x \notin N \cup P$ becomes $(x \notin N \text{ and }x \notin P)$ and $x \notin N \cap P$ becomes $(x \notin N \text{ or }x \notin P)$?

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