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Question-81091

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Question Number 81091 by arkanmath7@gmail.com last updated on 09/Feb/20
Commented by mind is power last updated on 09/Feb/20
what is b(A)?
$${what}\:{is}\:{b}\left({A}\right)? \\ $$
Commented by arkanmath7@gmail.com last updated on 09/Feb/20
cl(A) closure of A b(A) boundary of A d(A) derive of A
$${cl}\left({A}\right)\:{closure}\:{of}\:{A} \\ $$$${b}\left({A}\right)\:{boundary}\:{of}\:{A} \\ $$$${d}\left({A}\right)\:{derive}\:{of}\:{A} \\ $$$$ \\ $$$$ \\ $$

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