2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58468The evolution of a quantity, described by a function of space and time, relates the first derivative in time of this function to a spatial operator applied to the function. The initial value of the function at time $t=0$ is given. The fractional extension of this evolution consists of replacing the first derivative in time by a fractional derivative of order $α$, $0 < α\le 1$. We give a relationship between the solution of the equation of evolution and the solution of the equation belonging to its fractional extension.10 pages, AMS-TexMathematical Physicstext