Separation of variables in the diffusion equation. III

The Separation of variables of type N = 2 is completed, and all complete sets of type N = 1 are constructed for the diffusion equation with a scalar matrix for the leading derivatives.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 48–50, July, 1979.In conclusion, we take this opportunity to thank V. N. Shapovalov for continued interest.