Geodesic
The Hölder Exponent for Radially Symmetric Solutions of Porous Medium Type Equations
Canadian journal of mathematics, Tome 43 (1991) no. 2, pp. 313-321

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The density u(x, t) of an ideal gas flowing through a homogeneous porous media satisfies the equation Here m > 1 is a physical constant and u also satisfies the initial condition If the initial data is not strictly positive it is necessary to work with generalized solutions of the Cauchy problem (1), (2) (see [1]). By a weak solution we shall mean a function u(x, t) such that for (in the sense of distributions) and 
Hernandez, Gaston E.; Roussos, Ioannis M. The Hölder Exponent for Radially Symmetric Solutions of Porous Medium Type Equations. Canadian journal of mathematics, Tome 43 (1991) no. 2, pp. 313-321. doi: 10.4153/CJM-1991-017-1
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