  Let G be a finite group. For semi-free G-manifolds which are oriented in the
sense of Waner, the homotopy classes of G-equivariant maps into a G-sphere are
described in terms of their degrees, and the degrees occurring are
characterized in terms of congruences. This is first shown to be a stable
problem and then solved using methods of equivariant stable homotopy theory
with respect to a semi-free G-universe.
