Question: AP 12 Order in the Reals 129 Problems Problem 12.1. A student solved the following problem: Let S = Qn (0,4). Show that sup S

AP 12 Order in the Reals 129 Problems Problem 12.1. A student solved the following problem: Let S = Qn (0,4). Show that sup S = 4. Below is the student's solution. Criticize it. Not a proof (Student Solution). First we show that 4 is an upper bound. Let x E S. Then 0

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