Abstract
A contraction principle is valid for bond percolation models. If Gc is obtained from G by contraction of a set of edges, then the bond percolation critical probabilities satisfy pc(Gc)c(G). The contraction principle provides relationships between graphs which do not follow from the inclusion principle. Application of the principle provides the following bounds: 0.5000c pentagon lattice c Kagome lattice c (dice lattice).

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