Consider a set of points  on an attractor, then the
 correlation integral is
where 
 is the number of pairs 
 whose distance 
. For small 
,
where 
 is the correlation exponent.
Consider a set of points  on an attractor, then the
 correlation integral is
where 
 is the number of pairs 
 whose distance 
. For small 
,
where 
 is the correlation exponent.
Weisstein, Eric W. "Correlation Integral." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/CorrelationIntegral.html