The connected sum of -manifolds and is formed by deleting the interiors of -Balls in and attaching the resulting punctured Manifolds to each
other by a Homeomorphism
The connected sum of two Knots is called a Knot Sum.
See also Knot Sum
Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, p. 39, 1976.