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Title 
The connective constant of the honeycomb lattice equals $sqrt{2+sqrt2}$ 

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Submitted to  Annals of Mathematics. 2012, vol. 175, no. 3, p. 16531665  
Abstract  We provide the first mathematical proof that the connective constant of the hexagonal lattice is equal to $\sqrt{2+\sqrt 2}$. This value has been derived non rigorously by B. Nienhuis in 1982, using Coulomb gas approach from theoretical physics. Our proof uses a parafermionic observable for the self avoiding walk, which satisfies a half of the discrete CauchyRiemann relations. Establishing the other half of the relations (which conjecturally holds in the scaling limit) would also imply convergence of the selfavoiding walk to SLE(8/3).  
Stable URL  http://archiveouverte.unige.ch/unige:11959  
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arXiv: 1007.0575v1 

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