# Contents

## Idea

For $G$ a geometric group (e.g. a topological group or Lie group) and $P \to X$ a $G$-principal bundle, one says that $G$ is the structure group of $P$.

More generally, and less tautologically, if $V \to X$ is a $G$-associated bundle then one says that $V$ has structure group $G$.

Created on May 26, 2012 20:02:53 by Urs Schreiber (82.113.121.208)