(adsbygoogle = window.adsbygoogle || []).push({}); Prove that Cl(Q) = R in the standard topology

I'm really stuck on this problem, seeing as we haven't covered limit points yet in the text and are not able to use them for this proof. Can anybody provide me with help needed for this proof? Many thanks.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Closure of the Rational Numbers (Using Standard Topology)

**Physics Forums | Science Articles, Homework Help, Discussion**