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Suppose that A E B and that B has a greatest lower bound. Show that A has a greatest lower bound and that gle s gle. Let A C R (R represents the real numbers) and A non-empty. Prove TWO of the following: 1. glbA s lubA 2. Let x,y E A. Then |x - yls lubA - glbA 3. glbA = lubA if and only if A contains only a single element