Consider the metric space (R,d) with d(x,y) := |x - y| whenver x,y $\displaystyle \in$ R. Show that the set N is closed. Help please...
Follow Math Help Forum on Facebook and Google+
If x is not natural, there exists a natura number n such that n<x<n+1 This clearly implies that there exists an open set containing x and not lying N.
View Tag Cloud