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 Mar 21 awarded Editor Mar 21 revised Can the cubic mean- geometric mean inequality by a sum of 8 weighted squares? forgot to add the squares Mar 21 suggested approved edit on Can the cubic mean- geometric mean inequality by a sum of 8 weighted squares? Aug 20 asked Is the image of a continuous idempotent necessarily homotopic to the original space? Oct 3 asked What is the equivariant cohomology of the 0-sphere acting on the 1-sphere? Sep 10 asked Split short exact sequences and the associated graded algebra Aug 1 awarded Supporter Jul 30 comment How to prove that my sum coincides with a sequence on the Online Encyclopedia of Integer Sequences? Yes, in fact my formula for the Betti numbers above came from a long exact sequence. How is the Poincare series of a space related to the Poincare series of the other two spaces in the long exact sequence? Jul 29 comment How to prove that my sum coincides with a sequence on the Online Encyclopedia of Integer Sequences? I tried using the linear recurrence that express $a_n$ in terms of the three previous terms of the same parity. It seems more appropriate because my formula is split into cases by parity. However it is quite complicated (many boundary terms) because of the double sum. I couldn't manage to finish it. Jul 29 asked How to prove that my sum coincides with a sequence on the Online Encyclopedia of Integer Sequences? Dec 6 comment Is the quotient of a $K(\pi,1)$ by a discrete subset still an Eilenberg-MacLane space? So is the homotopy equivalence from $A/\{a,b\}$ to $A\vee_a S^1$ induced from the obvious map $A\to A\vee_a S^1$? Dec 5 comment Is the quotient of a $K(\pi,1)$ by a discrete subset still an Eilenberg-MacLane space? Is the quotient map given by $1_A \vee *:A\to A\vee \bigvee_{n-1} S^1$? I don't quite understand how you know the quotient space to be $A\vee \bigvee_{n-1} S^1$ Dec 4 awarded Student Dec 4 asked Is the quotient of a $K(\pi,1)$ by a discrete subset still an Eilenberg-MacLane space?