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Question: e114 let a and b be two nonempty sets of...

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E1.14: Let A and B be two nonempty sets of real numbers that are bounded above and Answer the following questions (a) Give an example to show that, in general, sup(AB) ab (b) Show that, if a < 0 and b< 0, then inf AB ab (c) Show that, if inf A>0 and inf B > 0, then sup AB-ab

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