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QUESTION
Let A be a subset of the metric space M and for SO define As = ( 20 EM :
How do I prove the following is open and that the intersection equals the closure of A?
2 . Let A be a subset of the metric space M and for SO defineAs = ( 20 EM : ( Fa E A ) d ( ac , a ) < 8 3Prove ( 1 ) that As is open and ( ii ) that Moods