When Is a Set of Lines in Space Convex?

Jacob E. Goodman

This article discusses a notion of convexity for sets of lines and higher-dimensional flats in Euclidean space that generalizes the notion of convexity of sets of points. Convex sets of lines exhibit some surprising behavior.
(pp. 222)
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The Mathematics of Lars Valerian Ahlfors

Frederick Gehring, Irwin Kra, Steven Krantz, and Robert Osserman

Lars Ahlfors was arguably the preeminent complex function theorist of the twentieth century. These warm reflections on Ahlfors's work include discussions of his research in conformal geometry, Kleinian groups, and quasiconformal mappings.
(pp. 233)
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The AMS and Mathematics Education: The Revision of the "NCTM Standards"

Roger Howe

Howe serves as the chair of the AMS committee advising the NCTM on the revision of its standards for K-12 mathematics education. This article describes the revision and the issues the committee has considered. The two committee reports appear on pages 270-276.
(pp. 243)
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Lars Valerian Ahlfors (1907-1996)

Raoul Bott, Clifford Earle, Dennis Hejhal, James Jenkins, Troels Jorgensen, Steven G. Krantz, Albert Marden, and Robert Osserman