Percolation theory deals with fluid flow (or any other similar process) in random media. If the medium is a set of regular Lattice Points, then there are two types of percolation. A Site Percolation considers the lattice vertices as the relevant entities; a Bond Percolation considers the lattice edges as the relevant entities.

**References**

Deutscher, G.; Zallen, R.; and Adler, J. (Eds.). *Percolation Structures and Processes.* Bristol: Adam Hilger, 1983.

Finch, S. ``Favorite Mathematical Constants.'' http://www.mathsoft.com/asolve/constant/rndprc/rndprc.html

Grimmett, G. *Percolation.* New York: Springer-Verlag, 1989.

Kesten, H. *Percolation Theory for Mathematicians.* Boston, MA: Birkhäuser, 1982.

Stauffer, D. and Aharony, A. *Introduction to Percolation Theory, 2nd ed.* London: Taylor & Francis, 1992.

© 1996-9

1999-05-26