4-manifolds with large symmetry groups
This paper provides a diffeomorphism classification of all closed oriented four dimensional manifolds which have an effective action of a compact (connected ?) non-abelian Lie group. In addition, the paper contains an equivariant classification of SU(2) and SO(3) actions on four dimensional manifolds. These are the crucial groups for the problem.
effective action of a compact non-abelian Lie group
scientific article; zbMATH DE number 3956013