*Guest post by Nicole Immorlica*

*We say goodbye this month to a profoundly inspiring mathematician and economist, David Gale. His influential paper with Lloyd Shapley entitled College Admissions and the Stability of Marriage in 1962 introduced the much-loved stable marriage problem to the literature. The problem asks how a matchmaker in a village can arrange marriages such that no couple wants to divorce their assigned partner and run off together. Such a set of marriages is called "stable", and the set of stable marriages turns out to have a beautiful and endlessly amusing mathematical structure, uncovering such universal truths as "the proposing side of the market ends up with the best partner." (I.e., be proactive in your personal life?) Beyond giving professors and students endless hours of fun and amazing lectures, the stable marriage problem has also had significant impact in many practical settings by providing policy-makers a powerful tool with which to design centralized markets like public school choice and the National Residency Matching Program (NRMP). While the stable marriage work is perhaps Gale's most well-known contribution, he has also contributed significantly to many other fields of math and economics, about which I am much less qualified to comment. He also developed a sort of online museum of mathematical concepts MathSite, which includes some really neat interactive exhibits and is accessible to people of all ages and skill levels.*

David Gale was 85, and is survived by his partner, Sandra Gilbert, three daughters, and two grandsons.

Sorry to hear it --- he was terrific. As a Berkeley math undergrad, I took a course in differential topology from him. I knew nothing about him at the time, and on the first day he openly and sheepishly admitted it was the first time he had taught the course. But he was a terrific teacher and I learned many interesting results, such as the Whitney Embedding Theorem, in his course. Only later did it dawn on me that he might have been interested in teaching the material because of its many game-theoretic/equilibrium connections.

ReplyDeleteYou can see a one-page description and example of the Stable Marriage Theorem at www.theoremoftheday.org. It is that rare thing, a beautiful piece of mathematics that is genuinely useful in everyday life.

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