2,853 reputation
21549
bio website anhhuy.ch
location Switzerland
age 22
visits member for 4 years, 2 months
seen 32 mins ago

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


Jan
4
revised How is this a counter example to “ $A$ and $B$ are isomorphic but $G/A \ncong G/B”$?
improved version
Jan
4
reviewed Looks OK How to compute sum with non consecutive indices in Maple?
Jan
3
revised $0$ and $p^n \mathbb{Z}_p$ are the only ideals of $\mathbb{Z}_p$
edited body
Jan
3
revised $0$ and $p^n \mathbb{Z}_p$ are the only ideals of $\mathbb{Z}_p$
added 8 characters in body
Jan
3
answered $0$ and $p^n \mathbb{Z}_p$ are the only ideals of $\mathbb{Z}_p$
Jan
3
comment $0$ and $p^n \mathbb{Z}_p$ are the only ideals of $\mathbb{Z}_p$
@fretty: $n$ can be $0$.
Jan
3
comment Diagonalization versus s.d. product for non-commuting Hermitian matrices
@nomadreid: Yes, they are equivalent, which is what I have shown in my post. First, I have shown that $[A, B] \neq 0$ is equivalent to (1) and then, I have given you the theorem that it is also equivalent to (2). Because equivalence of statements is an equivalence relation, (1) and (2) are equivalent to each other. This also applies to your third point: The point of my post was to show that (1) and (2) are not just consequences of $A$ and $B$ being non-commutative, but all three statements are equivalent!
Jan
3
revised Inversible Antisymmetric Matrix
added 21 characters in body; edited tags
Jan
3
answered Inversible Antisymmetric Matrix
Jan
3
answered Why $\|Ax\|^2=\frac{1}{4}\left(2\left<A(\beta x), v\right>+2\left<Av,\beta x\right>\right)$
Jan
3
revised System of vectors $\{f_1, f_2, \ldots, f_n\} \in V^*$ is a basis of $V^*$ if and only if $\ker f_1 \cap \ker f_2 …\cap \ker f_n = \{0\}$
formatting
Jan
3
reviewed Approve Near-rings: why are ideals defined like that?
Jan
3
reviewed Approve Regression vs Classification
Jan
3
reviewed No Action Needed Equation of a cubic function with inflection point on (0.5,0.5) and contains (0,0), (1,1)
Jan
2
comment Diagonalization versus s.d. product for non-commuting Hermitian matrices
@nomadreid: Which bases do you mean? My point was that both statement (1) and (2) are equivalent to $[A,B] \neq 0$, in case it wasn't clear. I thought you were trying to understand how one comes up with these two results.
Jan
2
revised double angle condition
added 41 characters in body
Jan
2
comment Why do we differentiate a function to eliminate the arbitrary constants?
Can you give an example when this happens?
Jan
2
comment If A is an open set does A the complement of A have to be closed? I know the opossite is true by definition, is this?
A set is closed if its complement is open.
Jan
2
revised Does order of qualifiers matter in FOL formula?
added 48 characters in body
Jan
2
comment How does $\sum_{k=0}^n (pe^t)^k{n\choose k}(1-p)^{n-k} = (pe^t+1-p)^n$?
en.wikipedia.org/wiki/Binomial_theorem#Statement_of_the_theorem