Angel Alonso
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 Feb 22 revised How to quickly recognize closed sets and open sets in $\mathbb{R}^2$ added 158 characters in body Feb 22 comment How to quickly recognize closed sets and open sets in $\mathbb{R}^2$ That's true, I will edit my answer. Feb 22 answered How to quickly recognize closed sets and open sets in $\mathbb{R}^2$ Feb 5 comment Determine the region of convergence of series of complex functions I am sorry, Did. It's true it is not fully answered. I have unaccepted the answer now. As for the problem, I have not been able to do further progress myself. Jan 29 asked Determine the region of convergence of series of complex functions Sep 24 awarded Autobiographer Feb 3 awarded Supporter Feb 2 awarded Scholar Feb 2 accepted Better proof of $(x_1^2+…+x_n^2)^2 \leq (x_1+…+x_n)(x_1^3+…+x_n^3)$? Feb 2 comment Better proof of $(x_1^2+…+x_n^2)^2 \leq (x_1+…+x_n)(x_1^3+…+x_n^3)$? Very nice, thanks! Feb 2 comment Better proof of $(x_1^2+…+x_n^2)^2 \leq (x_1+…+x_n)(x_1^3+…+x_n^3)$? Okay, thanks! I found it somewhat artificial, but I will stick with it. Feb 2 awarded Student Feb 2 awarded Editor Feb 2 revised Better proof of $(x_1^2+…+x_n^2)^2 \leq (x_1+…+x_n)(x_1^3+…+x_n^3)$? edited body Feb 2 asked Better proof of $(x_1^2+…+x_n^2)^2 \leq (x_1+…+x_n)(x_1^3+…+x_n^3)$?