A function [math] is said to have a jump discontinuity at [math] if:
1. [math] exists.
2. [math] exists.
3. The left and right limits are not equal.


Let [math]
Show that [math] has a jump discontinuity at [math] by calculating the limits from the left and right at [math].
[math]
[math]

Now for fun, try to graph [math].