The structure of differential forms on the bundle of connections p : C(P) -
-> M of a principal SU(2)-bundle pi : P --> M which are invariant under the
natural representation of the gauge algebra of P on connections is determi
ned. The invariance under the Lie algebra of all infinitesimal automorphism
s of P is also analyzed. (C) 1999 Elsevier Science B.V. All rights reserved
.