# Tagged Questions

**-1**

votes

**0**answers

56 views

### How to find number of nonisomorphic simple graphs from a number of edges and a number of vertices? [closed]

How many nonisomorphic simple graphs are there with __ vertices and _ edges?
(Fill in the blanks with numbers, say 6 and 4)
I've tried to use incident matrices to no avail.

**0**

votes

**4**answers

110 views

### about the structure of components of tensor product if more than one bipartite graph is taken

I was reading about tensor product of graphs. We know that if we take tensor product of n graphs and want this product to be a connected graph then at most one graph should be bipartite. In the book ...

**33**

votes

**6**answers

2k views

### Is it easy to produce hard-to-color graphs?

This question arises from my recent visit to my daughter's second-grade class, where I led some discussion and activities on graph coloring (see Math for seven-year-olds). In one such activity, each ...

**13**

votes

**1**answer

633 views

### Is every graph the center of some other graph?

The center of a graph $G$ is the set of vertices that minimize the largest
distance to vertices in $G$, e.g., in the graph below, that radius is $4$:
Define the ...

**2**

votes

**1**answer

95 views

### Subdividing toward a unit distance graph in the plane

I just want to ask, what is the significance of subdividing a graph toward a unit distance graph? I have seen several studies of it but I cannot find what its importance.
I mean, like the study of ...

**1**

vote

**1**answer

417 views

### Graph Theory and Subgraphs [closed]

Let T = (V , E) be a tree with |V | = n ≥ 2. How many distinct paths are there (as sub graphs) in T?
I already have the answer to this question as (n/2). The problem that I'm having is finding ...

**1**

vote

**1**answer

250 views

### Distance between vertices in a vertex transitive graphs. [closed]

Can anybody help me in finding out the distances between vertices in a vertex transitive graphs. Is there any specific formula to calculate distance between vertices in this graph. Thanks for your ...

**0**

votes

**0**answers

127 views

### A good upper bound on the size of k-biclique in random bipartite graphs.

Let $G = (X \cup Y, E)$ be a random bipartite graph, where $X$ and $Y$ are the set of vertices and $E$ the set of edges. I want to find an upper bound of the largest biclique in which exactly $k$ ...

**0**

votes

**1**answer

116 views

### expected size of unbalanced biclique in random bipartite graph

I am discovering random graph and I am trying to prove the following result. This is a follow-up on a previous question of mine
what's an upper bound on the size of the largest biclique in random ...

**3**

votes

**1**answer

134 views

### what's an upper bound on the size of the largest biclique in random bipartite graph?

I am not an expert in random graph but I need the following result and I couldn't find any reference on this.
Let $G(X \cup Y,p)$ be a random bipartite graph where the set of edges is $X \cup Y$, $X$ ...

**8**

votes

**1**answer

362 views

### Die-rolling Hamiltonian cycles

Let $R$ be a rectangular region of the integer lattice $\mathbb{Z}^2$,
each of whose unit squares is labeled with a number
in $\lbrace 1, 2, 3, 4, 5, 6 \rbrace$.
Say that such a labeled $R$ is ...

**3**

votes

**1**answer

630 views

### Decomposition of a complete graph into maximal matching subgraphs

Is there a general way to decompose a complete graph $K_n$ into an union of maximal matching subgraphs such that no two subgraphs share an edge?
For example, consider $K_4$ with vertices ...