Robin Thomas
The author, with three others, published a greatly simplified proof of the Four-Color Theorem in 1997. Starting with some of the theorem's history, he writes here about equivalent formulations, aspects of the new proof, and progress on some generalizations.
(pp. 848)
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Allyn Jackson and Dieter Kotschick
The eminent geometer S. S. Chern, still active at 86, speaks of his interaction with Élie Cartan, of his proof of the generalized Gauss-Bonnet Theorem, and of various approaches to differential geometry.
(pp. 860)
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