Can't tell if a given relationship in a sequence is an actual mathetmatical function? See how to find out with this free video math lesson. Need help finding the From Ramanujan to calculus cocreator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to tell whether a given relationship is a function.
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