The June/July issue features three quite distinct aspects of modern mathematics. John Milnor (recent Abel laureate and a father of differential topology) recounts the modern history of the subject of differential topology. Elias Wegert and Gunter Semmler present some new graphical representations of complex functions. And Joseph Grcar recounts the complex (and little-known) history of the technique of Gaussian elimination. Among the Communications articles is a remembrance of the remarkable mathematician Johannes Duistermaat.--Steven G. Krantz, Editor

### Elias Wegert and Gunter Semmler

(pp. 768)

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### Joseph F. Grcar

(pp. 782)

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### John Milnor

(pp. 804)

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