Question

Using Connectedness to Define Topology

score 212 · Answer 1 · 2026-03-25 17:27:12

212

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Using Connectedness to Define Topology

Published on 25 Mar 2026 - 17:27

score 95 · Answer 2 · 2018-04-20 02:25:04

95

Views

Minimum number of nodes to define all the nodes in a cyclic graph

Published on 20 Apr 2018 - 2:25

score 37 · Answer 3 · 2018-04-20 09:19:24

37

Views

If spanning tree then connected?

Published on 20 Apr 2018 - 9:19

score 36 · Answer 4 · 2026-03-25 01:28:50

36

Views

Faithful action on trees ensures that the action is faithfull of plane graphs?

Published on 25 Mar 2026 - 1:28

score 319 · Answer 5 · 2026-03-24 22:32:32

319

Views

Infinite rooms and doors (2)

Published on 24 Mar 2026 - 22:32

score 51 · Answer 6 · 2026-03-25 01:20:32

51

Views

If $|M'| \gt 2 |M|$ then show that there is an edge $e' \in M'$ such that $|M| \cup \{e'\}$ is a matching in G.

Published on 25 Mar 2026 - 1:20

score 299 · Answer 7 · 2018-04-20 17:52:41

299

Views

Claw and co-claw free graphs

Published on 20 Apr 2018 - 17:52

score 1.1k · Answer 8 · 2026-03-27 04:07:07

1.1k

Views

Degree sequence multigraph without loop

Published on 27 Mar 2026 - 4:07

score 2.4k · Answer 9 · 2018-04-20 21:28:19

2.4k

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Find all pairwise non-isomorphic graphs with the degree sequence (2,2,3,3,4,4)

Published on 20 Apr 2018 - 21:28

score 187 · Answer 10 · 2026-03-25 01:18:31

187

Views

Bipartite graph $G=(V,E)$ with parts $X$ and $Y$ satisfying $|\Gamma(S)| \geq \frac{|S|}{2}$ for any subset $S \subseteq X$

Published on 25 Mar 2026 - 1:18

score 95 · Answer 11 · 2026-03-25 17:21:44

95

Views

Show that if $U$ is a non-trivial module in a tree $T$, then every vertex of $U$ has degree $1$ in T.

Published on 25 Mar 2026 - 17:21

score 703 · Answer 12 · 2018-04-21 07:02:10

703

Views

Prove there is a path of length 6

Published on 21 Apr 2018 - 7:02

score 103 · Answer 13 · 2018-04-21 07:13:13

103

Views

Is it possible to calculate Hadwiger's number using $\Delta$ and $ \delta$?

Published on 21 Apr 2018 - 7:13

score 75 · Answer 14 · 2018-04-21 16:15:16

75

Views

A Combinatorics Problem Involving Some Badminton Players

Published on 21 Apr 2018 - 16:15

score 77 · Answer 15 · 2026-03-26 17:51:06

77

Views

Good luck heeey

Published on 26 Mar 2026 - 17:51

List Question

Using Connectedness to Define Topology

Minimum number of nodes to define all the nodes in a cyclic graph

If spanning tree then connected?

Faithful action on trees ensures that the action is faithfull of plane graphs?

Infinite rooms and doors (2)

If $|M'| \gt 2 |M|$ then show that there is an edge $e' \in M'$ such that $|M| \cup \{e'\}$ is a matching in G.

Claw and co-claw free graphs

Degree sequence multigraph without loop

Find all pairwise non-isomorphic graphs with the degree sequence (2,2,3,3,4,4)

Bipartite graph $G=(V,E)$ with parts $X$ and $Y$ satisfying $|\Gamma(S)| \geq \frac{|S|}{2}$ for any subset $S \subseteq X$

Show that if $U$ is a non-trivial module in a tree $T$, then every vertex of $U$ has degree $1$ in T.

Prove there is a path of length 6

Is it possible to calculate Hadwiger's number using $\Delta$ and $ \delta$?

A Combinatorics Problem Involving Some Badminton Players

Good luck heeey

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