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In this paper we construct an optimal system of subalgebras for the ninedimension Lie algebra of infinitesimal operators for a point symmetries group of a nonlinear heat equation with isotropic heat conductivity tensor and with a power dependence of the temperature. The results are presented as a lemma and a theorem. It is proven that up to transformations of internal automorphisms and some discrete automorphisms, there are 117 dissimilar subalgebras classes of various dimensions.

Optimal system of Lie algebra subalgebras of the point symmetries group for nonlinear heat equation without source