Removable isolated singularities for solutions of anisotropic porous medium equation

We study a class of quasilinear parabolic equations with model representative. partial derivative u/partial derivative t - Sigma(n)(i= 1) partial derivative/partial derivative(xi)(|u|(mi-1)partial derivative u/partial derivative(xi) = 0, m(i) > 1, i = 1,..., s, m(i) < 1, i = s + 1,..., n. We establish the pointwise condition for removability of singularity for solutions of such equations.