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 Yearling
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Jul
15
revised Expected value and the standard simple regression model
typo in the title
Jul
15
suggested approved edit on Expected value and the standard simple regression model
Jul
15
comment What are the general steps to turn a PDE into a dynamical system $\dot x(t)= Ax(t) + Bu(t)$
Check textbooks on control theory. The wiki page may also help: en.wikipedia.org/wiki/State-space_representation
May
17
awarded  Yearling
Apr
24
revised Calculating $a_n$ in $\sum_{n=1}^\infty a_n \sin(\frac{n \pi}{2})=T_0$
() -> \left(\right)
Apr
24
suggested approved edit on Calculating $a_n$ in $\sum_{n=1}^\infty a_n \sin(\frac{n \pi}{2})=T_0$
Apr
10
comment How many distinct elements are there in $C=\{zw\mid z∈A$,$w∈B\}, z^{24}=1$ and $w^{54}=1$.
But this is anyway an algebra problem.
Apr
8
revised Why are additional constraint and penalty term equivalent in ridge regression?
deleted 8 characters in body
Apr
7
revised Why are additional constraint and penalty term equivalent in ridge regression?
added 748 characters in body
Apr
7
revised How to solve the least square with $L_2$ norm constraint directly?
deleted 70 characters in body
Apr
7
revised How to solve the least square with $L_2$ norm constraint directly?
added 72 characters in body
Apr
7
revised The positive-definite-ness of RBF kernel
deleted 5 characters in body
Apr
7
asked How to solve the least square with $L_2$ norm constraint directly?
Apr
6
revised Why are additional constraint and penalty term equivalent in ridge regression?
added 17 characters in body
Apr
6
answered Why are additional constraint and penalty term equivalent in ridge regression?
Apr
6
comment Why are additional constraint and penalty term equivalent in ridge regression?
Can you briefly summarize the paper (since the journal version has some pages)?
Apr
6
comment Why are additional constraint and penalty term equivalent in ridge regression?
If $\alpha=0$, does it mean the corresponding $c$ can be any non-negative number, according to the second KKT condition?
Mar
20
revised How to compute/ find cancellation for the second group cohomology $H^2(G,A)$?
Added a missing $ in the title
Mar
20
suggested approved edit on How to compute/ find cancellation for the second group cohomology $H^2(G,A)$?
Jan
27
comment Does Euclidean division not work for general polynomials?
ED implies PID. But only polynomials of one variable can form a PID. So no.