An Alexander numbering assigns an integer to every region of an oriented link diagram so that crossing an oriented arc from right to left increases the integer by one. Under abelianization, a Dehn region generator with number maps to .

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  1. Dehn presentation of a knot group
  2. Knot group
  3. Knot exterior
  4. Knot
  5. Knot theory
  6. Geometry and topology
  7. Area of mathematics
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