Let S S;JRbe nonempty.Prove that if a number u in JRhas the properties:(i) for everyn e
Chapter 2, Problem 3(choose chapter or problem)
Let S S;JRbe nonempty.Prove that if a number u in JRhas the properties:(i) for everyn e N the numberu - 1In is not an upperbound of S, and (ii) for everynumbern e N the number u + 1In is an upperbound of S, then u = sup S. (This is the converse of Exercise 2.3.8.)
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