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Could someone please help me with this problem Let f: D - R and let c be an accumulation point of D . Suppose that

Could someone please help me with this problem

Let f: D - R and let c be an accumulation point of D . Suppose that lim f(x) > 0. x-C Prove that there exists a deleted neighborhood U of c such that f(x) > 0 for all x E UND

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