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Results tagged with graph-theory
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user 22967
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.
2
votes
2
answers
262
views
strongly regular graph as two-graph
is any strongly regular graph a regular two-graph?
two-graph:a two graph is a collection $B$ of 3-subsets a set $X$ with the property that, for any 4-subset $Y$ of $X$, an even numbers of $B$ belong …
- 179
0
votes
strongly regular graph as two-graph
ok, that's right, if $\Gamma$ is strongly regular graph with parameters $(v,k,\lambda,\mu)$
then it's regular two-graph if and only if $k=2\mu$
- 179
2
votes
1
answer
239
views
classify strongly regular graph with parameter (25,12,5,6)
how can i classify strongly regular graph with parameter $(25,12,5,6)$?
just i know we have fifteen $SRG(25,12,5,6)$ that two come from latin square(5)
- 179
0
votes
0
answers
621
views
transversal design
Let D denote a $1-(n, κ, m)$ design where two distinct blocks have at most one point in
common (i.e. D is a partial linear space). Then the block graph $\Gamma(D)$ has the blocks of D as vertices and …
- 179
3
votes
3
answers
332
views
Mclaughlin Graph
how can i construct a strongly regular graph with parameter $(275,112,30,56)$(Mclaughlin Graph), (105,32,4,12)?
I need adjacency matrix of them?
I know they are unique.
- 179
0
votes
1
answer
246
views
two non-degenerate quadratic forms on $GF(2)^2r$
I know this:
There are two non-degenerate quadratic forms on $GF(2)^2r$. The hyperbolic form may be taken to be
$Q^+(x)=x_0 x_1 + \cdots +x_{2r-2}x_{2r-1}$ ,
and the elliptic form to be
$Q^-(x)=x^2 …
- 179