Vol.1 Mathematics Basic Module Vol.1 Representation of Functions ppt1. The concept of the function: Let A and B be a non-empty number set. If according to a certain corresponding relationship f, for any number x in set A, there is a uniquely determined number f (x) and It corresponds, then we call f: A → B as a function from set A to set B. It is written as: y = f (x), x∈A.
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