Site vs bond percolation
Site: each vertex present w.p. p. Bond: each edge present w.p. p. Different thresholds.
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Critical exponents
Near p_c, correlation length ξ ~ (p - p_c)^(-ν). Cluster size distribution has power-law near p_c.
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Universality
Critical exponents depend only on dimension + few features, not specific lattice. Universal.
Applications
Forest fires. Epidemic spread. Disordered material conductivity. Wireless network coverage.