Question: 8 a a point xo in d is said to...

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8. a. A point xo in D is said to be an isolated point of D provided that there is anr > 0 such that the only point of D in the interval (xo-r, x。+ r) is xo itself. Prove that a point xo in D is either an isolated point or a limit point of D b. Suppose that xo is an isolated point of D. Prove that every function f: D R is continuous at xo.

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Question: 8 a a point xo in d is said to...

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