A concordance between knots  and 
 in 
 is a locally flat cylinder 
 embedded in 
 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 Resource. https://mathworld.wolfram.com/Concordance.html
 
         
	    
	
    
