Keywords. Surfaces, curves, geodesics, minimal intersections, metrics
AMS subject classification. Primary: 53C22. Secondary: 53C42,57R42.
Submitted: 8 January 2001. Accepted: 17 May 2001. Published: 2 June 2001.
Instituto de Matematicas UNAM,
Ciudad Universitaria, Mexico D.F. 04510, Mexico
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