## Probability Surveys

### Three theorems in discrete random geometry

Geoffrey Grimmett

#### Abstract

These notes are focused on three recent results in discrete random geometry, namely: the proof by Duminil-Copin and Smirnov that the connective constant of the hexagonal lattice is $\sqrt {2+ \sqrt {2}}$; the proof by the author and Manolescu of the universality of inhomogeneous bond percolation on the square, triangular, and hexagonal lattices; the proof by Beffara and Duminil-Copin that the critical point of the random-cluster model on $\mathbb{Z}^2$ is $\sqrt{q}/(1+ \sqrt{q})$. Background information on the relevant random processes is presented on route to these theorems. The emphasis is upon the communication of ideas and connections as well as upon the detailed proofs.

#### Article information

Source
Probab. Surveys, Volume 8 (2011), 403-441.

Dates
First available in Project Euclid: 30 December 2011

https://projecteuclid.org/euclid.ps/1325264817

Digital Object Identifier
doi:10.1214/11-PS185

Mathematical Reviews number (MathSciNet)
MR2861135

Zentralblatt MATH identifier
1245.60093

#### Citation

Grimmett, Geoffrey. Three theorems in discrete random geometry. Probab. Surveys 8 (2011), 403--441. doi:10.1214/11-PS185. https://projecteuclid.org/euclid.ps/1325264817

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