• Medientyp: E-Artikel
  • Titel: A Synthetic Characterization of the Hemisphere
  • Beteiligte: Croke, Christopher B.
  • Erschienen: American Mathematical Society, 2008
  • Erschienen in: Proceedings of the American Mathematical Society, 136 (2008) 3, Seite 1083-1086
  • Sprache: Englisch
  • ISSN: 0002-9939; 1088-6826
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: We show that round hemispheres are the only compact two-dimensional Riemannian manifolds (with or without boundary) such that almost every pair of complete geodesics intersect once and only once. We prove this by establishing a sharp isoperimetric inequality for surfaces with boundary such that every pair of geodesics has at most one interior intersection point.
  • Zugangsstatus: Freier Zugang