# Percolation theory

## Mathematical theory on behavior of connected clusters in a random graph / From Wikipedia, the free encyclopedia

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In statistical physics and mathematics, **percolation theory** describes the behavior of a network when nodes or links are added. This is a geometric type of phase transition, since at a critical fraction of addition the network of small, disconnected clusters merge into significantly larger connected, so-called spanning clusters. The applications of percolation theory to materials science and in many other disciplines are discussed here and in the articles Network theory and Percolation (cognitive psychology).