Editing Percolation theory (section)

==Different models==
*[[Directed percolation]] that models the effect of [[gravity|gravitational forces acting on the liquid]] was also introduced in {{harvtxt|Broadbent|Hammersley|1957}},<ref name="BroadbentHammersley1957"/> and has connections with the [[contact process (mathematics)|contact process]].
*The first model studied was Bernoulli percolation. In this model all bonds are independent.  This model is called bond percolation by physicists.
*A generalization was next introduced as the [[random cluster model|Fortuin–Kasteleyn random cluster model]], which has many connections with the [[Ising model]] and other [[Potts model]]s.
*Bernoulli (bond) percolation on [[complete graph]]s is an example of a [[random graph]].  The critical probability is&nbsp;{{math|''p'' {{=}} {{sfrac|1|''N''}}}}, where {{math|''N''}} is the number of vertices (sites) of the graph.
*[[Bootstrap percolation]] removes active cells from clusters when they have too few active neighbors, and looks at the connectivity of the remaining cells.<ref>{{citation
 | last = Adler | first = Joan | author-link = Joan Adler
 | doi = 10.1016/0378-4371(91)90295-n
 | issue = 3
 | journal = Physica A: Statistical Mechanics and Its Applications
 | pages = 453–470
 | title = Bootstrap percolation
 | volume = 171
 | year = 1991| bibcode = 1991PhyA..171..453A}}.</ref>
*[[First passage percolation]].
*[[Invasion percolation]].