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 Yearling
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Jul
13
awarded  Yearling
Jun
24
revised Concentration inequality of weighted sum of random variables given a tail inequality
a second attempt is explained
May
14
comment Why does $\frac{\textbf{g}^T\textbf{d}}{\textbf{d}^T\textbf{H}\textbf{d}}$ give the maximum of function $\mathcal{D}(\textbf{x}+\lambda\textbf{d})$
It's fine. You can simply add a sentence in the end titled update or edit and mention what was your mistake.
May
14
comment Why does $\frac{\textbf{g}^T\textbf{d}}{\textbf{d}^T\textbf{H}\textbf{d}}$ give the maximum of function $\mathcal{D}(\textbf{x}+\lambda\textbf{d})$
I think it is fine the way it is. However, it would have been better if you made your corrections in a way that people can see that the question is corrected/modified.
May
14
comment Why does $\frac{\textbf{g}^T\textbf{d}}{\textbf{d}^T\textbf{H}\textbf{d}}$ give the maximum of function $\mathcal{D}(\textbf{x}+\lambda\textbf{d})$
Yes, that's it.
May
14
comment Why does $\frac{\textbf{g}^T\textbf{d}}{\textbf{d}^T\textbf{H}\textbf{d}}$ give the maximum of function $\mathcal{D}(\textbf{x}+\lambda\textbf{d})$
They denote what you get from the Newton's formula $\lambda^+$ rather than $\lambda^*$. They first find the unconstrained maximum which is $\lambda^+$, and then check if it is in the interval $\Lambda$. If it is in the interval the $\lambda^*=\lambda^+$ otherwise $\lambda^*$ is at one of the endpoints of $\Lambda$.
Jan
15
revised The relation between $\inf_{R\in \mathsf{U}_n} \left\Vert A - BR\right\Vert^2_F$ and $\left\Vert AA^*-BB^*\right\Vert$
corrected little errors in math
Jan
14
revised The relation between $\inf_{R\in \mathsf{U}_n} \left\Vert A - BR\right\Vert^2_F$ and $\left\Vert AA^*-BB^*\right\Vert$
edited title
Jan
14
revised The relation between $\inf_{R\in \mathsf{U}_n} \left\Vert A - BR\right\Vert^2_F$ and $\left\Vert AA^*-BB^*\right\Vert$
edited body; edited title
Jan
14
asked The relation between $\inf_{R\in \mathsf{U}_n} \left\Vert A - BR\right\Vert^2_F$ and $\left\Vert AA^*-BB^*\right\Vert$
Dec
21
awarded  Constituent
Dec
8
awarded  Caucus
Sep
30
awarded  Explainer
Sep
3
answered Spectral norm of a Hadamard product
Sep
3
revised Spectral norm of a Hadamard product
edited body
Aug
28
revised Prove that Frobenius matrix norm is compatible with the vector norm
added 1 character in body
Aug
19
answered How to prove this inequality without using Muirhead's inequality?
Jul
13
awarded  Yearling
Jul
11
revised IMO 2014 problem 3, first day
added 7 characters in body
Jul
11
revised IMO 2014 problem 3, first day
added 7 characters in body