Articles written in Proceedings – Mathematical Sciences
Volume 93 Issue 2-3 December 1984 pp 137-145
We prove that any principal bundle on the affine line over a perfect field with a reductive group as structure group comes from the base field by base change.
Volume 106 Issue 4 November 1996 pp 421-449
We classify principal bundles on a compact Riemann surface. A moduli space for semistable principal bundles with a reductive structure group is constructed using Mumford’s geometric invariant theory.