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OR/MS Today - August 2005 Reminiscences of George B. Dantzig Gentle Soul Welcomed Me into His Research World By Richard W. Cottle, Stanford University My earliest reminiscence of George Dantzig dates back to 1961 when I was a first-year doctoral student in mathematics at U.C. Berkeley. I was a part-time programmer in the Computer Services Department of the Berkeley Radiation Laboratory (BRL) and was assigned to debug a large computer program for linear and quadratic programming. This was a real challenge for a person who knew little about computer programming and nothing about LP and QP.
What impressed me in the interview, as it did forever after, was George Dantzig's kindness. In going to meet this famous man, I had been expecting someone with a tough, Prussian-type personality. Instead, I met a gentle soul who welcomed me into his research world. My first assignment concerned the famous Hirsch conjecture. I worked on a pivot selection rule Dantzig hoped would achieve the minimum. It didn't, and I got nowhere with the Hirsch conjecture. Rather than insist that I struggle on with that difficult topic, he kindly suggested another problem: to extend the quadratic programming algorithm he included as Section 24-4 of his book, "Linear Programming and Extensions" (LP&E). This I did. I tossed my write-up on his messy desk, just as he had done with the problems he mistook for homework while studying with Jerzy Neyman decades earlier. Except in my case, the paper was never seen again. This was not a great loss to the scientific world, especially since Whinston and van de Panne had simultaneously discovered nearly the same algorithm. But as a by-product of this study, I was lucky enough to stumble across duality in quadratic and nonlinear programming. The latter was the subject of our first joint work. Further, it was the composition of primal and dual quadratic programs (analogous to what Albert Tucker had done with primal and dual linear programs) that led us to what was later to be called the linear complementarity problem. In those days, computer programming was done with punched cards, and manuscripts were typewritten and ultimately checked on long galley sheets. Textbooks on operations research topics were rare. Those of us who studied LP under George Dantzig in the very early 1960s were exposed to his book "LP&E" in the form of galley sheets. A group of us became proofreaders or indexers of these sheets; part of my job was to coordinate the lists of typos we found and present them to George. This could at times be tedious. I remember well how painstakingly he traversed the minefield of L.V. Kantorovich's contributions on the classical transportation problem. We spent half an hour wording the last paragraph of page 299 of "LP&E." Most of all, I remember with admiration and gratitude the many opportunities George Dantzig provided to his students, myself included. These included invitations to meet leading figures in the mathematical programming world, travel to professional conferences and social events. This generous approach was repeated for the benefit of dozens of students and is only one of the reasons George Dantzig was loved so much.
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