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 Aug 23 revised Projective plane and its dual put it into LaTeX format Aug 23 suggested approved edit on $f(a(x))=f(x)$ - functional equation Aug 23 suggested approved edit on Projective plane and its dual Aug 23 revised Why do we use the commutator bracket for Lie algebra's cleaned it up slightly Aug 23 suggested approved edit on Why do we use the commutator bracket for Lie algebra's Aug 23 comment Checking Uniform Convergence @Matt xkcd.com/105 Aug 23 comment Checking Uniform Convergence But it will only let me accept my own answer in 2 days as I have just found out, so if someone posts an answer before then I'll accept it. Aug 23 answered Checking Uniform Convergence Aug 23 revised Checking Uniform Convergence added 331 characters in body Aug 23 asked Checking Uniform Convergence Aug 21 revised What do finite, infinite, countable, not countable, countably infinite mean? Changed Z, Q, C Aug 21 suggested approved edit on What do finite, infinite, countable, not countable, countably infinite mean? Aug 21 comment What do finite, infinite, countable, not countable, countably infinite mean? If you do not know what $\mathbb{ Z, Q, R, C}$ are, then you need to build up some baseline knowledge before proving there are "more" real numbers than integers. Qiaochu is right in that Wikipedia will serve you best for now. Aug 21 answered Real life applications of Topology Aug 21 answered Proving that a bounded, continuous function has a supremum Aug 21 accepted Proving that a bounded, continuous function has a supremum Aug 21 comment Proving that a bounded, continuous function has a supremum how does part (b) look now that it has been revised? Aug 21 revised Proving that a bounded, continuous function has a supremum deleted 159 characters in body Aug 21 comment Proving that a bounded, continuous function has a supremum Unfortunately, we have not used the fundamentals of open balls and coverings so that machinery is unavailable to me... Aug 21 revised Proving that a bounded, continuous function has a supremum added 942 characters in body