Question: Let A ( represents the real numbers) and A non-empty. Prove TWO of the following: glbA lubA Let x,y A. Then |x - y| lubA

Let A ( represents the real numbers) and A non-empty. Prove TWO of the following: glbA lubA Let x,y A. Then |x - y| lubA - glbA glbA = lubA if and only if A contains only a single element

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