On the basis of a generalised star-triangle transformation and of existing conjectures concerning the critical point of some planar Potts models, the phase boundary is determined for the combined site-bond percolation problem on a number of lattices, including the triangular and the honeycomb lattice. As a special case, the critical probability for the honeycomb site problem is found to be p c -1/ square root 2.
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Imre Kondor (1980) studied this question.
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