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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 $(x_1^2+…+x_n^2)^2 \leq (x_1+…+x_n)(x_1^3+…+x_n^3)$?