André Weil: Memories of a Long Friendship

Henri Cartan

Henri Cartan reminisces about his friendship of more than seventy years with André Weil--about their days at the École Normale, the founding of Bourbaki, Weil's influence on Cartan's mathematics, wartime correspondence, and postwar visits to see each other.
(pp. 633)
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How the Alternating Sign Matrix Conjecture Was Solved

David Bressoud and James Propp

A curiosity-driven conjecture in combinatorics led to relations among determinants, Young diagrams, plane partitions, and statistical mechanics; and eventually a whole range of conjectures was proved at once in 1996.
(pp. 637)
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The Visualization of Mathematics: Towards a Mathematical Exploratorium

Richard S. Palais

Computer-generated visualizations are now a serious tool in mathematical research. The author describes needs in this area that are not met by commercial software, and he projects where the subject of mathematical visualization is headed.
(pp. 647)
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Irving Ezra Segal (1918--1998)

John C. Baez, Edwin F. Beschler, Leonard Gross, Bertram Kostant, Edward Nelson, Michèle Vergne, Arthur S. Wightman