How to Get the Random Graph with Non-Uniform Probabilities?

Abstract

The Rado Graph, sometimes also known as the (countable) Random Graph, can be generated almost surely by putting an edge between any pair of vertices with some fixed probability $p\in(0,1)$, independently of other pairs.

In this article, we study the influence of allowing different probabilities for each pair of vertices. More specifically, we characterize for which sequences $(p_n)_{n\in \mathbb{N}}$ of values in $[0,1]$ there exists a bijection $f$ from pairs of vertices in $\mathbb{N}$ to $\mathbb{N}$ such that if we put an edge between $v$ and $w$ with probability $p_{f(\{v,w\})}$, independently of other pairs, then the Random Graph arises almost surely.