Dehn Surgery
The operation of drilling a tubular Neighborhood of a Knot 
in 
and then gluing in a solidTorus so that its meridian curve goes to a 
-curve on the Torus boundary of the Knot exterior. Every compact connected 3-Manifold comes from Dehn surgery on a Link in .
References
Adams, C. C. The Knot Book: An Elementary Introduction to the Mathematical Theory of Knots. New York: W. H. Freeman, p. 260, 1994.
- Discontinuity
- Discontinuous
- Discordant Permutation
- Discrepancy Theorem
- Discrete Distribution
- Discrete Fourier Transform
- Discrete Mathematics
- Discrete Set
- Discrete Uniform Distribution
- Discriminant
- Discriminant (Binary Quadratic Form)
- Discriminant (Elliptic Curve)
- Discriminant (Metric)
- Discriminant (Module)
- Discriminant (Polynomial)
- Discriminant (Quadratic Curve)
- Discriminant (Quadratic Form)
- Discriminant (Second Derivative Test)
- Disdyakis Dodecahedron
- Disdyakis Triacontahedron
- Disjoint
- Disjunction
- Disjunctive Game
- Disk
- Disk Covering Problem