1,854 reputation
21136
bio website anhhuy.ch
location Switzerland
age 22
visits member for 4 years
seen 2 hours ago

My name is Anh Huy Truong and I am currently studying mathematics at the ETH Zürich.


Apr
2
comment How can I find $\sup -\frac{x_1^2 + 7 x_2^2}{2 x_1 x_2}$ for $x_1 x_2 > 0$?
Thank you very much.
Apr
2
accepted How can I find $\sup -\frac{x_1^2 + 7 x_2^2}{2 x_1 x_2}$ for $x_1 x_2 > 0$?
Apr
2
asked How can I find $\sup -\frac{x_1^2 + 7 x_2^2}{2 x_1 x_2}$ for $x_1 x_2 > 0$?
Mar
27
comment How to prove that every nondegenerate critical point of $f$ has a neighbourhood which does not contain any further critical points?
Wow, this is incredibly easy... So I actually don't even need Taylor's formula?
Mar
27
accepted How to prove that every nondegenerate critical point of $f$ has a neighbourhood which does not contain any further critical points?
Mar
27
comment How to prove that every nondegenerate critical point of $f$ has a neighbourhood which does not contain any further critical points?
Let $x_0$ be the critical nondegenerate point. As far as I know, the inverse function theorem tells me that there exist neighbourhoods $U$ of $x_0$ and $V$ of $0$, such that the inverse function of $Df$ is continuously differentiable. But how do I proceed now?
Mar
27
asked How to prove that every nondegenerate critical point of $f$ has a neighbourhood which does not contain any further critical points?
Mar
24
revised Anecdotes about famous mathematicians or physicists
added 160 characters in body
Mar
24
comment Anecdotes about famous mathematicians or physicists
@Brandon: Of course I would also love to learn about anecdotes from the personal lives of mathematicians. :)
Mar
24
comment Anecdotes about famous mathematicians or physicists
@Brandon: Like what? The examples I provided also are not directly related to maths but more to physics...
Mar
24
asked Anecdotes about famous mathematicians or physicists
Mar
20
awarded  Editor
Mar
20
revised How can I simplify my $\Delta f$?
edited body
Mar
20
accepted How can I simplify my $\Delta f$?
Mar
20
comment How can I simplify my $\Delta f$?
Thank you very much, it's actually pretty easy but somehow I just didn't see it.
Mar
19
comment How can I simplify my $\Delta f$?
We did not yet introduce or even prove Gauss' theorem yet. There must be a way to get to the result without using it, then...
Mar
19
comment How can I simplify my $\Delta f$?
@joriki: I will remember to use it in the future.
Mar
19
comment How can I simplify my $\Delta f$?
Which exactly is the second/the third equation?
Mar
19
revised Prove Simpson's rule (including error) using the integral remainder
edited tags
Mar
19
revised How to prove $C_1 \|x\|_\infty \leq \|x\| \leq C_2 \|x\|_\infty$?
edited tags