Some Aspects of Diffusion Theory Lectures given at a Summer School of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Varenna (Como), Italy, September 9-27,1966

V.C.A. Ferraro: Diffusion of ions in a plasma with applications to the ionosphere.- P.C. Kendall: On the diffusion in the atmosphere and ionosphere.-F. Henin: Kinetic equations and Brownian motion.- T. Kahan:Théorie des réacteurs nucléaires: méthodes de résolution perturbationnelles, interactives et variationnelles.- C. Cattaneo: Sulla conduzione del calore.- C. Agostinelli: Formule di Green per la diffusione del campo magnetico in un fluido elettricamente conduttore.- A. Pignedoli: Transformational methods applied to some one-dimensional problems concerning the equations of the neutron transport theory.- A. Pignedoli: On the rigorous analysis of the problem of neutron transport in a slab geometry and on some other results.- G. Sestini: Principi di massimo per le soluzioni di equazioni paraboliche.