Needham Calculus: Function continuous on its entire domain

Continuity is a weird concept. Some functions are continuous on their entire domain, whereas others aren't. In this example, we go over how to demonstrate that a function IS continuous on its entire domain. This uses the limit definition of continuity, which becomes a lot easier when you're only plugging in domain values in the first place. (It can get a little thornier when you use oddly constructed functions or domains, but we don't address that here. Maybe in another video!)