Question

A problem on the $n\times n$ square

score 251 · Answer 1 · 2026-05-11 00:19:36

251

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A problem on the $n\times n$ square

Published on 11 May 2026 - 0:19

score 126 · Answer 2 · 2026-05-11 01:41:45

126

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Edges on $K_{2,m}$ free graph

Published on 11 May 2026 - 1:41

score 56 · Answer 3 · 2026-04-13 14:18:08

56

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Size of a family of subsets of $[n]$, where any two subsets are non-disjointed, none contains the other, and the union of them is not $[n]$.

Published on 13 Apr 2026 - 14:18

score 68 · Answer 4 · 2026-05-11 00:23:11

68

Views

Finding large solution-free sets

Published on 11 May 2026 - 0:23

score 357 · Answer 5 · 2026-04-16 18:44:37

357

Views

Permutation: solutions to linear equation: Compute the number of all solutions $(x_1, x_2,\dots, x_n)$ of the equation $x_1+x_2+\dots+x_n=k$

Published on 16 Apr 2026 - 18:44

score 39 · Answer 6 · 2026-04-15 10:11:58

39

Views

Split n numbers into k lists with equal size, which any different combination of m lists contains all the n numbers

Published on 15 Apr 2026 - 10:11

score 175 · Answer 7 · 2026-05-11 00:15:26

175

Views

New Character in Chess game

Published on 11 May 2026 - 0:15

score 271 · Answer 8 · 2026-04-12 04:08:37

271

Views

How can I find the number of different triangles in $n$-vertex graph?

Published on 12 Apr 2026 - 4:08

score 329 · Answer 9 · 2026-05-11 04:10:45

329

Views

Let $G$ be an $n$-vertex graph with at most $100n$ triangles. Prove that $G$ has a triangle-free...

Published on 11 May 2026 - 4:10

score 178 · Answer 10 · 2026-03-26 12:51:40

178

Views

Assignment problem cost matrix reconstruction justification

Published on 26 Mar 2026 - 12:51

score 43 · Answer 11 · 2026-04-15 20:36:01

43

Views

Confusion on applying Szemeredi's lemma to graph building etc

Published on 15 Apr 2026 - 20:36

score 59 · Answer 12 · 2026-05-10 23:29:40

59

Views

Show ex$(n, H)\leq \left\lfloor\frac{n^2+n}{4}\right\rfloor$

Published on 10 May 2026 - 23:29

score 48 · Answer 13 · 2026-05-10 23:29:41

48

Views

In a random graph $G(n,p)$ with $\delta(G) \geq \delta$, how is the event $\{S \subset V \text{ is not a dominating set} \}$ characterized?

Published on 10 May 2026 - 23:29

score 398 · Answer 14 · 2026-04-13 16:50:04

398

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In how many different ways can we place $k$ elements in $n$ boxes in which each box has a fixed maximum capacity?

Published on 13 Apr 2026 - 16:50

score 248 · Answer 15 · 2026-04-14 00:54:53

248

Views

Maximal intersecting family of $X = \{1, \ldots, 7\}$

Published on 14 Apr 2026 - 0:54

List Question

A problem on the $n\times n$ square

Edges on $K_{2,m}$ free graph

Size of a family of subsets of $[n]$, where any two subsets are non-disjointed, none contains the other, and the union of them is not $[n]$.

Finding large solution-free sets

Permutation: solutions to linear equation: Compute the number of all solutions $(x_1, x_2,\dots, x_n)$ of the equation $x_1+x_2+\dots+x_n=k$

Split n numbers into k lists with equal size, which any different combination of m lists contains all the n numbers

New Character in Chess game

How can I find the number of different triangles in $n$-vertex graph?

Let $G$ be an $n$-vertex graph with at most $100n$ triangles. Prove that $G$ has a triangle-free...

Assignment problem cost matrix reconstruction justification

Confusion on applying Szemeredi's lemma to graph building etc

Show ex$(n, H)\leq \left\lfloor\frac{n^2+n}{4}\right\rfloor$

In a random graph $G(n,p)$ with $\delta(G) \geq \delta$, how is the event $\{S \subset V \text{ is not a dominating set} \}$ characterized?

In how many different ways can we place $k$ elements in $n$ boxes in which each box has a fixed maximum capacity?

Maximal intersecting family of $X = \{1, \ldots, 7\}$

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