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The study of probability distributions over graphs. For example, the Erdős–Rényi model where each edge occurs independently with equal probability.

0 votes
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Fast uniform generation of random graphs with given degree sequences - any implementation?

The implementation by Nick Wormald and colleagues is available from his webpage.
Matthieu Latapy's user avatar
4 votes
2 answers
200 views

Fast uniform generation of random graphs with given degree sequences - any implementation?

The paper below presents a linear-time algorithm for uniform generation of random graphs with given degree sequences [1]. This is very interesting in practice, but I found no implementation. However, …
Matthieu Latapy's user avatar
4 votes
Accepted

Random graphs defined by a set of tiles

The question you ask is, in my opinion, extremely important: decomposing a graph into a (small) set of small graphs (the tiles or ego-centered sub-graphs, for instance), and then characterizing how th …
Matthieu Latapy's user avatar
1 vote

Degree sequences after vertex removals

Several works study the degree sequence obtained when vertices are removed from random graphs with given degree sequence. Vertices are generally removed by decreasing order of degrees, or uniformly at …
Matthieu Latapy's user avatar
5 votes
3 answers
794 views

Probability of an edge in a random graph

Consider a vertex set $V$ and a degree sequence $(d_v)_{v\in V}$. I want to know the probability that an edge exists between two given vertices $u$ and $v$ in a random graph with this degree sequence. …
Matthieu Latapy's user avatar
3 votes
0 answers
104 views

Random graphs with prescibed degrees and triangles

In short: a random graph model generates (multi-)graphs with prescribed number of edges and minimal number of triangles for each vertex. Questions arise about the actual number of triangles and the gr …
Matthieu Latapy's user avatar
6 votes
0 answers
295 views

Probability that a random multigraph is simple

Question. Consider a given sequence of $n$ integers $d_1$, $d_2$, $\cdots$, $d_n$ with $\sum_i d_i$ even and $d_i\le n$ for all $i$. One may sample a random multi-graph having this degree sequence us …
Matthieu Latapy's user avatar
2 votes
0 answers
69 views

Are two degree sequences compatible, for random simple graph generation?

Consider a set $V$ of $n$ vertices, and three degree sequences $a_i$, $b_i$ and $c_i$ such that $c_i = a_i+b_i$, $i=1..n$. Assume these degree sequences are graphical: there exist simple graphs (no lo …
Matthieu Latapy's user avatar
2 votes

What nodes of a graph should be vaccinated first?

This is a much studied question, at the crossroad of several fields: epidemiology, mathematics, statistical mechanics, and computer science, at least. The model you consider is known as SI with parame …
Matthieu Latapy's user avatar
2 votes

How to show that random graphs cannot be embedded with short edges

This is really not an answer to your question, but too long for a comment and I think it may be of interest. I would like to relate your question to community detection in graphs. There is a wide vari …
Matthieu Latapy's user avatar
2 votes

Random subgraph properties

I fear the question is difficult in its general form: the answer will strongly depends on the assumptions we make regarding the initial graph, and on how we choose $n$. As noticed by @dodd, in particu …
Matthieu Latapy's user avatar
5 votes
3 answers
407 views

Simple graphs with prescribed degrees as disjoint union of simple subgraphs with prescribed ...

Consider a set $V$ of $n$ vertices, and three degree sequences $a_i$, $b_i$ and $c_i$ such that $c_i = a_i+b_i$, $i=1..n$. Assume these degree sequences are graphical: there exist simple graphs (no lo …
Matthieu Latapy's user avatar
5 votes
Accepted

Simple graphs with prescribed degrees as disjoint union of simple subgraphs with prescribed ...

The answer to this question is No. Let us assume $V = \{1,2,3,4,5,6\}$ and consider degree sequences $a = [3,2,2,1,0,0]$, $b = [1,0,0,3,2,2]$ and $c = a+b = [4,2,2,4,2,2]$. The only simple graph with …
Matthieu Latapy's user avatar