within epsilon of

from The Free On-line Dictionary of Computing (8 July 2008)

epsilon
within epsilon of

   1. <character> The fifth letter of the Greek alphabet.

   2. <mathematics> (From the Hungarian mathematician {Paul
   Erdos}) A very small, insignificant, or negligible quantity of
   something.

   The use of epsilon is from the {epsilon-delta method} of
   {proof} in {differential calculus}.

   (2001-07-06)