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Theory and applications of probability and stochastic processes: e.g. central limit theorems, large deviations, stochastic differential equations, models from statistical mechanics, queuing theory.

9 votes
1 answer
479 views

What does convergence in distribution "in the Gromov–Hausdorff" sense mean?

I am trying to understand this survey article by Le Gall on Brownian geometry, especially the statement of Theorem 1. The basic statement of the theorem is $$(m_n,d_n) \to (m_{\infty}, d_{\infty})$$ …
Matthew Kahle's user avatar
12 votes
2 answers
987 views

Is there a percolation threshold in the hard discs model?

Take a random configuration of $n$ non-overlapping discs of radius $r$ in the unit square $[0,1]^2$. (You could think of this as taking $n$ points uniform randomly in $[r,1-r]^2$ and then restricting …
Matthew Kahle's user avatar
6 votes
2 answers
724 views

Has the following kind of (minimum degree $d$) random graph been studied?

The following random construction is simple enough that I am guessing it must have been studied. Fix $d \ge 3$, and let $n > d$. For each of the $n$ vertices, pick exactly $d$ other vertices to conne …
Matthew Kahle's user avatar
10 votes
1 answer
455 views

For what range of edge probability does the following property hold for random graphs?

Let $G(n,p)$ denote the Erdős–Rényi model of random graph. For a given function $p = p(n)$ we say that $G \in G(n,p)$ asymptotically almost surely has property $\mathcal{P}$ if $$\mbox{Pr}[G \mbox{ …
Matthew Kahle's user avatar
13 votes
2 answers
381 views

Comparing two measures on trees on $n$ vertices

A standard measure on trees on $n$ vertices is the Uniform Spanning Tree (UST) on the complete graph. This is the measure where every tree has equal probability, $1 / n^{n-2}$ by Cayley's formula. H …
Matthew Kahle's user avatar
8 votes
1 answer
309 views

Longest induced cycles in random geometric graphs near criticality

We make a random geometric graph $X(n;r)$ as follows. Choose $n$ points uniformly, independently, in the unit square $[0,1]^2$, for vertices, and then connect a pair of vertices $\{ p,q \}$ by an edge …
Matthew Kahle's user avatar
21 votes
11 answers
4k views

What are some good examples of non-monotone graph properties?

It seems that many, if not almost all, of the properties studied in graph theory are monotone. (Property means it is invariant under permutation of vertices, and monotone means that the property is e …
Matthew Kahle's user avatar
18 votes
2 answers
1k views

In an Erdős–Rényi random graph, what is the threshold for the property "every edge is contai...

Let $G(n,p)$ denote the Erdős–Rényi random graph, where $n$ is the number of nodes and $p$ is the probability for each edge. I'm interested in precisely what range of $p$ the random graph has at least …
Matthew Kahle's user avatar
27 votes
2 answers
804 views

What is the right notion of self-dual (two-dimensional) percolation in R^4?

For a lattice in $\mathbb{R}^2$, if we include each edge independently with probability $p$ (i.e. bond percolation), it is well known that there is a critical probability $0 < p_c < 1$ depending on th …
Matthew Kahle's user avatar
12 votes
3 answers
1k views

How to sample a uniform random polyomino?

A polyomino is formed by joining finitely many unit squares edge to edge. It may be regarded as a finite subset of the regular square tiling with a connected interior. In particular, for us, polyomino …
Matthew Kahle's user avatar
57 votes
4 answers
15k views

Connectivity of the Erdős–Rényi random graph

It is well-known that if $\omega=\omega(n)$ is any function such that $\omega \to \infty$ as $n \to \infty$, and if $p \ge (\log{n}+\omega) / n$ then the Erdős–Rényi random graph $G(n,p)$ is asymptoti …
Matthew Kahle's user avatar