Spherical curves that bound immersed discs

George K. Francis

Research output: Contribution to journalArticlepeer-review


Let/be an immersion of the oriented circle in the oriented sphere. Let the image lie in general position and have tangent winding number t with respect to some point oe in its complement. The extensions of/to an orientation preserving immersion of the disc are classified up to topological equivalence by the (0, i(l — i-))-assemblages induced by a star of rays from oo to the complementary components of the curve. Applications to the classification problem of stable maps between closed surfaces are also discussed.

Original languageEnglish (US)
Pages (from-to)87-93
Number of pages7
JournalProceedings of the American Mathematical Society
Issue number1
StatePublished - Nov 1973

ASJC Scopus subject areas

  • General Mathematics
  • Applied Mathematics


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