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 Apr 23 revised Induce measure between topological spaces. added 3 characters in body Apr 23 revised Distance from a point to empty set. TeX Apr 20 revised Fixed point Exercise on a compact set added 3 characters in body Apr 9 revised If $f'$ tends to a positive limit as $x$ approaches infinity, then $f$ approaches infinity Learnt some english. So used it. Mar 30 awarded Notable Question Mar 20 awarded Popular Question Mar 15 awarded Yearling Mar 2 revised Is a prime factor of a number always less than its square root? added 6 characters in body Feb 17 revised Chapter 3 Hoffman Kunze Linear Algebra exercise 12 added 11 characters in body Jan 22 awarded Famous Question Jan 16 comment $A$ and $B$ homeomorphic if they are different sets in bigger topological space No. ${}{}{}{}{}{}$ Dec 23 comment Sum of like powers equal to a power While you´re asking a different question, this seems related. Dec 12 revised Lagrange's identity in the complex form added 3 characters in body Dec 10 awarded Revival Dec 9 awarded Popular Question Nov 2 awarded Popular Question Oct 24 awarded Notable Question Oct 23 revised Prove $\ker(T^n)=\ker(T^{n+1})$ and $\operatorname{range}(T^n)=\operatorname{range}(T^{n+1}).$ deleted 1 character in body Sep 30 comment What is the definition of a set? Which set theory are they talking about when they say that the thing which has, say, all the rings is not set? Why is not good to consider such a thing a set? Sep 12 revised How to show $\lim_{n \to \infty} a_n = \frac{ [x] + [2x] + [3x] + \dotsb + [nx] }{n^2} = x/2$? added 1 character in body