Let ACR. • We say that is an interior point of A if for some e > 0, Ve (x)C R. The set of all interior points of A will be denoted by A°. • We say that x is a boundary point of A if for every e > 0, Ve (x) N A#Ø and Ve (x)N A° Ø. The set of all boundary points of A will be denoted by ðA. Show that • Ā = A° U aA.

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