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Aug
1
comment Why can I multiply both sides by $dx$?
Depends on how deep down the rabbit hole you want to go :). You might be interested in reading up on "differential forms" in the context of differential geometry.
Aug
1
comment Radian, an arbitrary unit too?
@lopi Hi sorry, I've been very busy lately. I'll try to get back to this sometime after next week.
Aug
1
answered Why can I multiply both sides by $dx$?
Jul
30
awarded  Popular Question
Jun
10
reviewed Reopen Combination sum .
Jun
10
reviewed Reopen Why modulo prime prefered over modulo composite?
Jun
10
reviewed Reopen How many people are included in three-hop network analysis?
Jun
9
awarded  Enlightened
Jun
8
revised A prettier way of on how to prove the identities
edited body
Jun
8
answered A prettier way of on how to prove the identities
Jun
6
revised Solve the differential equation using separation of variables: $\frac{dy}{dx} = e^{3x+2y}$
deleted 2 characters in body
Jun
6
comment How to solve $4^x+\sin(x)=10$
This basically is Essam's answer in different notation.
Jun
6
answered Solve the differential equation using separation of variables: $\frac{dy}{dx} = e^{3x+2y}$
Jun
5
comment Why the spatial/mathematician's Fourier Transform?
The function $f(k x-\omega t)$ is a graph which moves to the "right", which is sort of the $+k$ direction. The function $f(\vec{k} \cdot \vec{x} - \omega t)$ is some sort of wave which moves in the direction of $\vec{k}$. $f(\vec{k} \cdot \vec{x} + \omega t)$ is a wave which moves in the direction opposite of $\vec{k}$. This is why the sign change is there, though it is not necessary.
Jun
5
comment Why the spatial/mathematician's Fourier Transform?
Thanks for sharing that. I don't have time for a detailed answer but here is a quick explanation about the sign change:
Jun
5
comment Why the spatial/mathematician's Fourier Transform?
Do you have a source where you've read the term "mathematician's Fourier Transform". Personally I've never heard of the term.
Jun
5
reviewed Leave Open Relationship between the square of the Frobenius norm and the Frobenius norm of the square
Jun
5
reviewed Leave Open Big-O Constants Rule Question for not-monotonically non-decreasing functions
Jun
5
reviewed Leave Open Is there a relation between $End(M)$ and $M$ under tensor products?
Jun
5
reviewed Leave Open Find sum of series