X be given by J(*) 2. Let X be the set of real numbers, let U be the usual topology, and let D be the discrete topology. Suppose f: X-X is given by f(z)=z³. Which of the following are continuous? Explain. (a) f: (X.U) - (X.D). (b) f: (X,D)-(X.U).

Q: invertible

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