### Deleting and Inserting Fixed-Point Sets on Disks , by Masaharu Morimoto

It is a basic problem to determine manifolds which can occur as the
fixed-point sets of smooth actions on spheres of a given finite group.
This paper solves the problem in the case where the finite group is a
nontrivial perfect group or a nilpotent Oliver group.

Masaharu Morimoto <morimoto@ems.okayama-u.ac.jp >