The partial differential equation
Porous Medium Equation
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References
Elliott, C. M.; Herrero, M. A.; King, J. R.; and Ockendon, J. R. "The Mesa Problem: Diffusion Patterns forReferenced on Wolfram|Alpha
Porous Medium EquationCite this as:
Weisstein, Eric W. "Porous Medium Equation." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/PorousMediumEquation.html