Keywords. Positive curvature, unit tangent bundle of S^4
AMS subject classification. Primary: 53C20. Secondary: 53C20, 58B20, 58G30.
Submitted to GT on 27 March 1999. (Revised 30 July 1999.) Paper accepted 6 October 1999. Paper published 14 October 1999.
Peter Petersen, Frederick Wilhelm
Department of Mathematics, University of California
Los Angeles, CA 90095, USA
Department of Mathematics,University of California
Riverside, CA 92521-0135, USA
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