8. Let (X, d) be a metric space, and A, B are subset of X, then (i) Fr(A) = A O (A)° = A – int A (ii) Fr(A) = ¢ if and only if A is both open and closed (iii) A is closed if and only if A Fr(A) (iv) A is open if and only if A° 2 Fr(A) (v) Fr(AN B)C Fr(A) U Fr(B). The equality holds if Ar B = ¢ (vi) Fr(int A) C Fr(A). 2msadt sno wollo

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Solve v,vi 

8. Let (X, d) be a metric space, and A, B are subset of X, then
(i) Fr(A) = A n (A)° = Ã – int A
A - int A
%D
(ii) Fr(A) = 0 if and only if A is both open and closed
%3D
(iii) A is closed if and only if A Fr(A)
ini
(A mi)
(iv) A is open if and only if A° 2 Fr(A)
(v) Fr(AnB) C Fr(A) U Fr(B). The equality holds if A N B = ¢
(vi) Fr(int A) C Fr(A).
%3D
bas amonoori mort wollo
Transcribed Image Text:8. Let (X, d) be a metric space, and A, B are subset of X, then (i) Fr(A) = A n (A)° = Ã – int A A - int A %D (ii) Fr(A) = 0 if and only if A is both open and closed %3D (iii) A is closed if and only if A Fr(A) ini (A mi) (iv) A is open if and only if A° 2 Fr(A) (v) Fr(AnB) C Fr(A) U Fr(B). The equality holds if A N B = ¢ (vi) Fr(int A) C Fr(A). %3D bas amonoori mort wollo
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