Question

(b) In a metric space (X, d) if A CX be any
non-empty subset, then prove that
(i) Int(A) is the largest open subset in A
(ii) Ext(A) is the largest open subset in
X-A
(iii) Fr (A) = A ~ Int(A)
where the symbols have their usual
meanings.​

Answer 1

Answer:

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