Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with graph-theory
Search options not deleted
user 19729
Questions about the branch of combinatorics called graph theory (not to be used for questions concerning the graph of a function). This tag can be further specialized via using it in combination with more specialized tags such as extremal-graph-theory, spectral-graph-theory, algebraic-graph-theory, topological-graph-theory, random-graphs, graph-colorings and several others.
3
votes
Accepted
Proving that the complement of a bipartite graph has chromatic number equal to clique number
According to this Wikipedia entry
the statement that $\chi(\overline{G}) = \omega(\overline{G})$ for all bipartite $G$ is actually equivalent to König's Theorem.
- 3,407
6
votes
Does the hypergraph of subgroups determine a group?
As @Keith Kearnes says, the negative answer ought to be somewhere in Roland Schmidt's book. Unless I'm mistaken, it suffices to find two non isomorphic groups with isomorphic coset lattices. Indeed, …
- 3,407
0
votes
When does a graph underlie the Hasse diagram of a poset?
This is not an answer, but some context.
A somewhat related notion is that of comparability graphs: these are the graphs for which there is a poset $P$ on the vertex set such that $\{x,y\}$ is an edge …
- 3,407
5
votes
A flag complex is contractible iff the underlying graph is....?
A nice graph theory lemma for showing homotopy equivalence that builds on the "clique starring" already discussed is stated as Lemma 3.2 of Alexander Engström's paper arXiv:math/0508148. I'll rephras …
- 3,407
1
vote
Is the empty graph a tree?
Some comments above discuss the question from the point of view of homology. I'd like to expand on these.
You might consider a tree to be an abstract simplicial complex of dimension at most 1 that ha …
- 3,407