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Feb
8
awarded  Notable Question
Feb
1
awarded  Notable Question
Dec
28
awarded  Notable Question
Oct
27
accepted Find the angle of complex number
Oct
27
asked Find the angle of complex number
Oct
20
comment Find a function by its Fourier coefficients
Yes. $x[n]$ is the extension one.
Oct
20
asked Find a function by its Fourier coefficients
Oct
11
comment How to differentiate $(y-X\beta)^T(y-X\beta)$ w.r.t. $\beta$ and useful formulas in this context?
Thanks for the answer but the textbook answer is $-2X^T(y-X\beta)$. Shouldn't I use $\partial f / \partial \beta = \nabla f$?
Oct
11
revised How to differentiate $(y-X\beta)^T(y-X\beta)$ w.r.t. $\beta$ and useful formulas in this context?
added 65 characters in body
Oct
11
asked How to differentiate $(y-X\beta)^T(y-X\beta)$ w.r.t. $\beta$ and useful formulas in this context?
Sep
20
awarded  Yearling
Aug
3
awarded  Popular Question
Jun
22
revised How to prove rigorously $L[\delta(t-a)] = e^{-as}$?
added 117 characters in body
Jun
22
asked How to prove rigorously $L[\delta(t-a)] = e^{-as}$?
Jun
18
asked Find $f(1)$ given the following ($f$ polynomial)
Jun
12
comment How do I prove $\log(x^n)=n\log|x|$?
If you want to prove the above formula for all real $x \neq 0 $ and $n \in \mathbb{N}$ (though I'm not sure it'd be true), you need to extend your consideration to complex numbers, extending the domain of $\log$ to complex numbers
Jun
12
revised How do I prove $\log(x^n)=n\log|x|$?
added 144 characters in body
Jun
12
comment How do I prove $\log(x^n)=n\log|x|$?
If you consider in real numbers only, the domain of $\log$ should be restricted to $(0,\infty)$.
Jun
12
comment How do I prove $\log(x^n)=n\log|x|$?
The above formula does not hold for arbitrary real $x$ and natural $n$; in this case $\log$ is not even defined properly
Jun
12
comment How do I prove $\log(x^n)=n\log|x|$?
Yes he is right