%0 Journal Article
%T An equation of Monge-Ampere type in conformal geometry, and four-manifolds of positive Ricci curvature
%A Sun-Yung A. Chang
%A Matthew J. Gursky
%A Paul C. Yang
%J Mathematics
%D 2004
%I arXiv
%X We formulate natural conformally invariant conditions on a 4-manifold for the existence of a metric whose Schouten tensor satisfies a quadratic inequality. This inequality implies that the eigenvalues of the Ricci tensor are positively pinched.
%U http://arxiv.org/abs/math/0409583v1