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Vijay Singh chauhan Asked a Question
November 15, 2020 6:48 am 30 pts
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• Deepak singh
See here , irrational number (e) is the limit of a sequence of rationals. So , Q is not closed (for a set to be closed it should contain all of its limit points). Similarly the...
Deepak singh
and [a,infinity) is closed because take any €-neigbourhood around any element of x belongs to [a,infinity ) , then this neighbourhood intersection with [a,infinity ) (excluding ele...