A homeomorphism of a closed disc that fixes its boundary pointwise is isotopic relative to the boundary to the identity. Radially interpolate the action toward the center after identifying the disc with the unit ball.

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  1. Alexander method
  2. Alexander system
  3. Mapping class group
  4. Topological surface
  5. Topology
  6. Geometry and topology
  7. Area of mathematics
  8. Mathematics
  9. Home

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