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Jun
23
comment Approximating dirac delta function with sinc functions
@MattRosenzweig I don't really have time to address this but if you have a fix you're welcome to implement it.
May
8
awarded  Yearling
May
5
comment Positive and negative complex numbers?
In fact, engineers have taken this to the extreme of saying that $j=-i$ is the real square root of -1, and changed all their formulas accordingly. (Well, sort of. They care mostly about time dependence, so they prefer the form $e^{j\omega t}$, whereas spatially-minded physicists prefer $e^{i(kz-\omega t)}$ for plane waves. And they feel $i$ is an appropriate symbol for current, so they shifted over to $j$. They assure me it makes sense.) Whatever the reasons, there are large stretches of physics vs engineering formula mismatches which are magically fixed by setting $j=-i$.
Jan
27
awarded  Nice Answer
Jan
24
revised Is there something special about 2015?
edited body
Jan
24
answered Is there something special about 2015?
Dec
8
awarded  Caucus
Nov
12
answered Addition in linear vector spaces
Oct
1
comment A simple test for degenerate eigenvalues of a holomorphic matrix-valued function?
@Daniel Is there a way to obtain it directly from the matrix?
Oct
1
revised A simple test for degenerate eigenvalues of a holomorphic matrix-valued function?
edited title
Oct
1
asked A simple test for degenerate eigenvalues of a holomorphic matrix-valued function?
Sep
24
awarded  Autobiographer
Aug
13
comment An outrageous way to derive a Laurent series: why does this work?
@mistermarko I think it is clear that the order of summation cannot be changed, as $$\sum_{n=0}^\infty n^k$$ diverges for all $k\geq 0$.
Aug
8
awarded  Excavator
Aug
8
revised What does it mean to say an integral exists 'in the distributional sense'?
Edited for grammar, particularly the title. This was the second google result for "in the distributional sense", so it needs some sprucing up.
Aug
8
suggested approved edit on What does it mean to say an integral exists 'in the distributional sense'?
Jul
1
revised Fourier series is to Fourier transform what Laurent series is to …?
added 588 characters in body
May
8
awarded  Yearling
Apr
11
comment Approximating dirac delta function with sinc functions
This feels a bit circular. Isn't the integral in question the key element of the double-Fourier-transform theorem you invoke at the end?
Apr
10
comment Approximating dirac delta function with sinc functions
Oh, yes, you are right - that's pretty subtle. You are again correct, it is cancellations and not absolute convergence that makes $K$ vanish, so it is essentially a version of the Riemann-Lebesgue lemma. I will redo that section when I have time.