Volume 112, Issue 3 – November 1980

## Topology of three dimensional manifolds and the embedding problems in minimal surface theory

Pages 441-484 by William H. Meeks III, Shing-Tung Yau

## A complete moduli space for $K3$ surfaces of degree $2$

Pages 485-510 by Jayant Shah

## Strong rigidity for ergodic actions of semisimple Lie groups

Pages 511-529 by Robert J. Zimmer

## Strong general algorithms. I: Arithmetic groups

Pages 531-583 by Fritz Grunewald, Daniel Segal

## Some general algorithms. II: Nilpotent groups

Pages 585-617 by Fritz Grunewald, Daniel Segal