Connected Sum
The connected sum 
of 
-manifolds 
and 
is formed by deleting the interiors of -Balls 
in 
and attaching the resulting punctured Manifolds 
to eachother by a Homeomorphism 
, so
is required to be interior to 
and 
bicollared in to ensure that the connected sum isa Manifold.The connected sum of two Knots is called a Knot Sum.
See also Knot Sum
References
Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, p. 39, 1976.
- Obtuse Triangle
- Ochoa Curve
- Octacontagon
- Octadecagon
- Octagon
- Octagonal Number
- Octagram
- Octahedral Graph
- Octahedral Group
- Octahedral Number
- Octahedron
- Octahedron 5-Compound
- Octahemioctacron
- Octahemioctahedron
- Octakaidecagon
- Octal
- Octant
- Octatetrahedron
- Octic Surface
- Octillion
- Octodecillion
- Octonion
- Odd Function
- Odd Number
- Odd Number Theorem