We establish the interface equation and prove the regularity of the interface for the porous medium equation whose solution is radial symmetry.
Submitted October 7, 2000. Published November 13, 2000.
Math Subject Classifications: 35K65.
Key Words: porous medium, radial symmetry, interface, C-infinity regularity.
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| Youngsang Ko |
Department of Mathematics
Suwon, Kyonggi-do, 442-760, Korea
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