Volume 117, Issue 2 – March 1983

## On the symplectic geometry of deformations of a hyperbolic surface

Pages 207-234 by Scott Wolpert

## The Nielson realization problem

Pages 235-265 by Steven P. Kerckhoff

## Harmonic analysis on semigroups

Pages 267-283 by Michael G. Cowling

## $C$ is not algebraically equivalent to $C^-$ in its Jacobian

Pages 285-291 by Giuseppe Ceresa

## Groups generated by reflections and aspherical manifolds not covered by Euclidean space

Pages 293-324 by Michael W. Davis

## On the method of Thue-Siegel

Pages 325-382 by Gregory Volfovich Chudnovsky

## The uniqueness case for finite groups

Pages 383-454 by Michael Aschbacher