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A curve on which points of a Map 
 (such as the Mandelbrot Set) diverge to a given value 
 at
the same rate.  A common method of obtaining lemniscates is to define an Integer called the Count which is the
largest 
 such that 
 where 
 is usually taken as 
.  Successive Counts then define a series of
lemniscates, which are called Equipotential Curves by Peitgen and Saupe (1988).
See also Count, Mandelbrot Set
References
Peitgen, H.-O. and Saupe, D. (Eds.).  The Science of Fractal Images.
  New York: Springer-Verlag, pp. 178-179, 1988.