Let M be an n-dimensional complete Riemannian manifold, we investigate the geometric nature of such M which admits any of the family of Sobolev-type inequalities with the optimal Euclidean Sobolev constant. This leads to several conditions under which M with nonnegative Ricci curvature is isometric to Euclidean space R-n.
机构:
Univ Picardie Jules Verne, Fac Sci, 33 Rue St Leu, F-80039 Amiens 1, FranceUniv Picardie Jules Verne, Fac Sci, 33 Rue St Leu, F-80039 Amiens 1, France
Farina, Alberto
Ocariz, Jesus
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机构:
Univ Autonoma Madrid, Fac Ciencias, Ciudad Univ Cantoblanco, E-28049 Madrid, SpainUniv Picardie Jules Verne, Fac Sci, 33 Rue St Leu, F-80039 Amiens 1, France