Non-negatively curved 5-manifolds with almost maximal symmetry rank. [Preprint]

We show that a closed, simply-connected, non-negatively curved 5-manifold admitting an effective, isometric T2 action is diffeomorphic to one of S5, S3×S2, S3×~S2 (the non-trivial S3-bundle over S2) or the Wu manifold SU(3)/SO(3).