let X=R wth the usual metric. prove that the open and bounded interval A=(1,2) is an open set in R.


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Question Number 134940 by Oyins last updated on 08/Mar/21

$l e t X = R w t h t h e u s u a l m e t r i c . p r o v e t h a t t h e o p e n$ $a n d b o u n d e d i n t e r v a l A = (1, 2) i s a n o p e n s e t i n R .$
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