Abstract

In percolation theory the critical probability Pc(G) of an infinite connected graph G is defined as the supremum of those values of the occupation probability for which only finite clusters occur. An interesting question is the following: is each number between 0 and 1 the critical probability of some graph? It is shown that the answer is positive. A remarkable intermediate result is that for an important class of graphs the following holds: for each p>or=Pc(G) there exists a subgraph of G with critical probability equal to p.

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