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In the course of the years the names of Korteweg and de Vries have come to beclosely associated. The equation which is named after them plays a fundamentalrole in the theory of non-linear partial differential equations. What are theorigins of the doctoral dissertation of De Vries and of the Korteweg-de Vriespaper? Bastiaan Willink, a distant relative of both of these mathematicians,has sought to answer these questions. This article is based on a lecturedelivered by the author at the symposium dedicated to Korteweg and de Vries atUniversity of Amsterdam in September 2003.

The collaboration between Korteweg and de Vries -- An enquiry into personalities