Changes
I like your changes, but an "infinitely small ball" is not intuitive :-)
if for any <math>\varepsilon > 0</math>, there exists a number <math>N</math>, such that
<math>
|a_n - a| < \varepsilon</math> for every <math>n > N</math>. Intuitively, this means that if you have take an infinitely [[interval]] as small ball as you like, [[center]]ed at the limit point, then most - i.e., all but a finite number - of the points of the sequence are in that ballinterval.
==Limit of a Function==
