### Dennis Hejhal, Coordinating Editor

Friends and colleagues recall the life and work of the distinguished number theorist.

(pp. 692)

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### Friedrich E. P. Hirzebruch and Matthias Kreck

The notion of genus appears in many areas of mathematics. The authors discuss this concept, from its origins in Riemann surface theory to its use in geometry, topology, and the index theorems of analysis.

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