Why is f not a function from R to R if a) f(x) = 1/x b)

Chapter 2, Problem 2.3.1

(choose chapter or problem)

Why is f not a function from R to R if a) f(x) = 1/x? b) f(x) = .JX? ,.--,,..- c) f(x) = J(x2 + I )?

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