Epstein, Paul S. (1937) On the Equation of Diffusion. Proceedings of the National Academy of Sciences of the United States of America, 23 (2). pp. 9498. ISSN 00278424. http://resolver.caltech.edu/CaltechAUTHORS:EPSpnas37a

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Abstract
Under the title "The Analytical Theory of Probability," A. Kolmogoroff [1] published a few years ago a mathematically elegant account of what might be called the general theory of diffusion. As the main result of his analysis, he sets up two differential equations for transition probabilities (see below). The first of them contains as its independent variables the initial parameters of the transition probability and has an analytical form resembling the ordinary diffusion equation. Unlike it, the second differential equation (depending on the final parameters) has a different form unfamiliar to the physicist. The puzzling asymmetry of the two equations, as to whose physical reasons the author gives no hint, was, in our opinion, the main cause why the work of Kolmogoroff did not receive more attention. Unless these reasons are fully understood, an intelligent application of the theory to practical problems is very difficult. We think it, therefore, worth while to present in the following lines a discussion of the mutual connection between the two equations of Kolmogoroff and of their relation to other forms of the diffusion equation used in physics.
Item Type:  Article 

Additional Information:  Copyright © 1937 by the National Academy of Sciences Communicated December 30, 1936 
Issue or Number:  2 
Record Number:  CaltechAUTHORS:EPSpnas37a 
Persistent URL:  http://resolver.caltech.edu/CaltechAUTHORS:EPSpnas37a 
Alternative URL:  http://www.pnas.org/content/vol23/issue2/ 
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ID Code:  5692 
Collection:  CaltechAUTHORS 
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Deposited On:  27 Oct 2006 
Last Modified:  14 Nov 2014 19:19 
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