Abstract
In this paper the (2+1)-nonlinear diffusion equation u t −div(f(u)grad u)=0 with variable diffusivity is considered. Using the Lie method, a complete symmetry classification of the equation is presented. Reductions, via two-dimensional Lie subalgebras of the equation, to first- or second-order ordinary differential equations are given. In a few interesting cases exact solutions are presented.
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Bokhari, A.H., Al Dweik, A.Y., Kara, A.H. et al. A symmetry analysis of some classes of evolutionary nonlinear (2+1)-diffusion equations with variable diffusivity. Nonlinear Dyn 62, 127–138 (2010). https://doi.org/10.1007/s11071-010-9704-8
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DOI: https://doi.org/10.1007/s11071-010-9704-8