### Stephen Semmes

This article discusses some aspects of Heisenberg groups and the ways in which their algebraic structure is reflected in Fourier analysis, complex analysis, and geometry.

(pp. 640)

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### Ravi Vakil

The moduli space of curves plays a key role in algebraic geometry. This article focuses on the so-called tautological ring, emphasizing its combinatorial structure.

(pp. 647)

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