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Unit 5 Quadratic Equations amp Functions
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Group Theory and the Rubik's Cube
people.math.harvard.edu1. Functions To understand the Rubik’s cube properly, we rst need to talk about some di erent properties of functions. De nition 1.1. A function or map ffrom a domain Dto a range R(we write f: D!R) is a rule which assigns to each element x2Da unique element y2R. We write f(x) = y. We say that yis the image of x and that xis a preimage of y.