Recent content by bender2

i'm afraid i don't know how to do it. can you show me please? and is the way with Cauchy sequence correct?

Homework Statement let |e-x-e-y| be a metric, x,y over R. let X=[0,infinity) be a metric space. prove that X is closed, bounded but not compact. Homework Equations The Attempt at a Solution there is no problem for me to show that X is closed and bounded. but how do I prove...