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visits member for 2 years, 6 months
seen Oct 25 at 10:35

Jun
6
comment Is $f$ injective in $W$?
Thanks. It's mean that the proof of this expression is in definition of injective function. $f(x) = f(y) => x=y $
Jun
6
comment Is $f$ injective in $W$?
@AdenDong, you are right. Thanks
May
28
comment Prove an inequality about $\arctan 1/(nx)$ for any $x$ and $n$
@Didier, I'm sorry, I was wrong. And then, after showed?
May
28
comment Prove an inequality about $\arctan 1/(nx)$ for any $x$ and $n$
Didier, thanks. How to show it? I thought that $$ \tan(u)< u $$