A 2-dimensional discrete percolation model is said to be mixed if both graph vertices and graph edges may be "blocked" from allowing fluid flow (i.e., closed in the sense of percolation theory). This is in contrast to the more-studied cases of bond percolation and site percolation, the standard models for which allow only edges and vertices, respectively, to be blocked. Considered a bridge between bond percolation and site percolation, mixed percolation models have become increasingly more studied since their inception in the earl 1980s. Indeed, many of the properties of and methods related to this type of percolation can be found in work done by Hammersley.

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