Changes
That is,
:For every M > 0, there is a δ > 0 such that, whenever <math>0 < |x-X| < \delta, \quad f(x) > M\,</math>
Consider the function
:<math>\lim_{x\to X}f(x) = - \infty\,</math>
means
:For every M < 0, there is a δ > 0 such that, whenever <math>0 < |x-X| < \delta, \quad f(x) < ,M.</math>
[[category:mathematics]]