Question

To prove that in a metric of reals set of natural numbers is closed

Answer 1

Answer:Let (R,d) be the metric space where

d(x,y)=|x−y|∀x,y∈R

Show that the set N of natural numbers is closed.

I tried the complement method but i don't know what to do after i let an element belong to the complement?

Step-by-step explanation: it is correct or not im not confirmed