62 reputation
3
bio website
location Russia
age
visits member for 2 years, 5 months
seen Sep 25 at 15:31

Oct
8
accepted Epsilon-delta proof of continuity
Jun
8
asked Epsilon-delta proof of continuity
Jun
6
accepted Is $f$ injective in $W$?
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
Jun
6
asked Is $f$ injective in $W$?
May
28
awarded  Supporter
May
28
awarded  Scholar
May
28
accepted Prove an inequality about $\arctan 1/(nx)$ for any $x$ and $n$
May
28
awarded  Student
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 $$ \tan(u)< u $$
May
28
asked Prove an inequality about $\arctan 1/(nx)$ for any $x$ and $n$