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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
0 answers
539 views

Partitioning graph for Graph Isomorphism [closed]

Motivation: I am studying the graph isomorphism problem. I am trying to construct a partitioning method to reduce search cases . Construction: $G$ is an $r$ regular graph, $k$ connected (not a comple …
Michael's user avatar
  • 267
2 votes
0 answers
186 views

Classification of Automorphism set of a Regular graph

Let $A$ be the adjacency matrix of an $r$-regular graph $G$ with $n$ vertices (Not complete or cycle graph) . Also, let $Aut(G)$ be the set of all its automorphisms (i.e. set of permutation matrices) …
Michael's user avatar
  • 267
2 votes
1 answer
377 views

Graph Isomorphism for Triangle Free graph

Is there any specific computational complexity result of Graph Isomorphism for Triangle Free graphs? Anything close to the subject will help and of course, I have searched Google.
Michael's user avatar
  • 267
1 vote
0 answers
452 views

Possibility of Disconnected Subgraphs of a $k$ Connected $r$ regular Graph under a given con...

Context: Given a adjacency matrix A of a $r$-regular graph $G$ (not complete graph $K_{r+1}$) . $G$ is $k$ connected. The matrix A can be divided into 4 sub-matrices based on adjacency of vertex $x …
Michael's user avatar
  • 267
1 vote
0 answers
122 views

Isomorphism with fixed number of Permutations [closed]

Suppose, I have a fixed number of permutations for each sub-graph to determine isomorphism of whole graph. Is it possible to determine efficiently ? For example, $G, H$ are isomorphic graphs. For …
Michael's user avatar
  • 267
1 vote
0 answers
204 views

Complexity of reordering a matrix which consists independent sub matrices

Introduction: Given a matrix A of a $k$ regular graph G. The matrix A can be divided into 4 sub matrices based on adjacency of vertex $x \in G$. $A_x$ is the symmetric matrix of the graph $(G-x)$, …
Michael's user avatar
  • 267
1 vote
0 answers
235 views

"Graph Individualization"[ reference request] [closed]

Context: I am studying Weisfeiler Lehman method(WL method) and have clear idea about 1 and 2 dimensional WL method. I was wondering about the individualization process described below- Individualiz …
Michael's user avatar
  • 267
0 votes
1 answer
255 views

Decomposition of a regular graph and connected subgraphs

I have asked almost same question earlier. I have been told that my question was poorly written, so I am trying to write it more clearly in this post. Also, this time I would be a little different in …
Michael's user avatar
  • 267
0 votes
0 answers
306 views

Graph Coloring: Two adjacent vertices share same color

Consider, subgraphs $G_1, G_2,...... G_x$ of graph $G$. Each subgraph has $k$ vertices. Now, Fix subgraph $G_1$ and consider another subgraph $G_k$ where $1 <k \le x$. The edge set between $ …
Michael's user avatar
  • 267