A concordance between knots 
and 
in 
is a locally flat cylinder ![C=S^1×[0,1]](/images/equations/Concordance/Inline4.svg)
embedded in ![S^3×[0,1]](/images/equations/Concordance/Inline5.svg)
in such a way that the ends 
are embedded in 
as 
. Concordance is also called a knot cobordism.
Concordance
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References
Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, p. 227, 1976.Referenced on Wolfram|Alpha
ConcordanceCite this as:
Weisstein, Eric W. "Concordance." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Concordance.html