Positively curved GKM-manifolds
Abstract
Let T be a torus of dimension at least k and M a T-manifold. M is a GKMk-manifold if the action is equivariantly formal, has only isolated fixed points, and any k weights of the isotropy representation in the fixed points are linearly independent. In this paper we compute the cohomology rings with real and integer coefficients of GKM3- and GKM4-manifolds which admit invariant metrics of positive sectional curvature.
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