Question

Are there only seven 3-connected planar graphs with certain symmetries?

score 512 · Answer 1 · 2026-04-10 16:25:35

512

Views

Are there only seven 3-connected planar graphs with certain symmetries?

Published on 10 Apr 2026 - 16:25

score 80 · Answer 2 · 2026-04-14 13:48:07

80

Views

Casework and another argument yielding contradictory results

Published on 14 Apr 2026 - 13:48

score 50 · Answer 3 · 2026-04-10 03:20:01

50

Views

Expansion of a Polynomial

Published on 10 Apr 2026 - 3:20

score 538 · Answer 4 · 2026-04-10 04:50:26

538

Views

Help on how I should solve combinatorics

Published on 10 Apr 2026 - 4:50

score 204 · Answer 5 · 2026-04-13 13:04:33

204

Views

Bijection Explanation?

Published on 13 Apr 2026 - 13:04

score 62 · Answer 6 · 2026-04-29 12:41:14

62

Views

Counting "mulstisets" on a given sequence.

Published on 29 Apr 2026 - 12:41

score 126 · Answer 7 · 2026-04-12 21:28:16

126

Views

Catalan number application in arrangement

Published on 12 Apr 2026 - 21:28

score 1k · Answer 8 · 2026-04-16 12:07:36

1k

Views

Any partition of $\{1,2,\ldots,100\}$ into seven subsets yields a subset with numbers $a,b,c,d$ such that $a+b=c+d$.

Published on 16 Apr 2026 - 12:07

score 78 · Answer 9 · 2026-04-14 07:34:04

78

Views

A contradiction hidden in the definition of the probability of the intersection of events?

Published on 14 Apr 2026 - 7:34

score 339 · Answer 10 · 2026-04-29 12:28:58

339

Views

Maximum $n$ such that ${n \choose k} \,2^{1 - {k \choose 2}} < 1$ (where $k$ is a constant)

Published on 29 Apr 2026 - 12:28

score 65 · Answer 11 · 2026-04-16 07:25:36

65

Views

Proof that $\left.\frac{d^{2n}}{ds^{2n}}\right|_{s=0} e^{s^2/2}=(2n-1)!!$

Published on 16 Apr 2026 - 7:25

score 147 · Answer 12 · 2026-04-13 19:08:55

147

Views

Find a generating function for product of Stirling numbers.

Published on 13 Apr 2026 - 19:08

score 7.9k · Answer 13 · 2026-04-14 18:01:48

7.9k

Views

Number of surjective functions from a set with $m$ elements onto a set with $n$ elements

Published on 14 Apr 2026 - 18:01

score 151 · Answer 14 · 2026-04-14 03:23:42

151

Views

How many square integers less than $n$?

Published on 14 Apr 2026 - 3:23

score 617 · Answer 15 · 2026-04-10 12:05:27

617

Views

Clarifications on proof of Sperner's Theorem

Published on 10 Apr 2026 - 12:05

List Question

Are there only seven 3-connected planar graphs with certain symmetries?

Casework and another argument yielding contradictory results

Expansion of a Polynomial

Help on how I should solve combinatorics

Bijection Explanation?

Counting "mulstisets" on a given sequence.

Catalan number application in arrangement

Any partition of $\{1,2,\ldots,100\}$ into seven subsets yields a subset with numbers $a,b,c,d$ such that $a+b=c+d$.

A contradiction hidden in the definition of the probability of the intersection of events?

Maximum $n$ such that ${n \choose k} \,2^{1 - {k \choose 2}} < 1$ (where $k$ is a constant)

Proof that $\left.\frac{d^{2n}}{ds^{2n}}\right|_{s=0} e^{s^2/2}=(2n-1)!!$

Find a generating function for product of Stirling numbers.

Number of surjective functions from a set with $m$ elements onto a set with $n$ elements

How many square integers less than $n$?

Clarifications on proof of Sperner's Theorem

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