10 std relations and functions formulas
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other words, a function f is a relation such that no two pairs in the relation has the same first element. The notation f : X →Y means that f is a function from X to Y. X is called the domain of f and Y is called the co-domainof f. Given an element x ∈ X, there is a unique element y in Y that is related to x.
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Step-by-step explanation:
A function is a relation in which each input has only one output. In the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.
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