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In this video, I want to familiarize you with the idea of a limit, which is a super important idea. Its really the idea that all of calculus is based upon. But despite being so super important, its actually a really, really, really, really, really, really simple idea. So let me draw a function here, actually, let me define a function here, a kind of a simple function. So lets define f of x, lets say that f of x is going to be x minus 1 over x minus 1. And you might say, hey, Sal look, I have the same thing in the numerator and denominator. If I have something divided by itself, that would just be equal to 1. Cant I just simplify this to f of x equals 1? And I would say, well, youre almost true, the difference between f of x equals 1 and this thing right over here, is that this thing can never equal-- this thing is undefined when x is equal to 1. Because if you set, let me define it. Let me write it over here, if you have f of, sorry not f of 0, if you have f of 1, what happens.
