Board Thread:Spam/@comment-26350354-20160312173821/@comment-16107481-20160315174450


 * $$\lim_{x \to 0^-} \frac{1}{x^r} = \begin{cases} -\infty, & \text{if } r \text{ is odd} \\ +\infty, & \text{if } r \text{ is even}\end{cases} $$