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Aug
17
comment Is there an equation to describe regular polygons?
You're basically using $\arctan \cot x$ here as your sawtooth… :)
Aug
17
comment Is there an equation to describe regular polygons?
What is the difference between this and Raskolnikov's answer?
Aug
17
comment Derivation of approximation of Error function
Antoine, I will need to review this again, which will take some time. It has admittedly been a while since I've ever had to manipulate Chebyshev series for approximation purposes…
Aug
17
revised Finding Local Linear Basis Functions
edited tags
Aug
16
revised Is there a discrete version of de l'Hôpital's rule?
deleted 4 characters in body
Aug
16
comment Why does L'Hôpital's rule work for sequences?
possible duplicate of Is there a discrete version of de l'Hôpital's rule?
Aug
14
awarded  Necromancer
Aug
11
comment Problem with Integration using substitution
If you differentiate both of your results, do you get the original function?
Aug
3
revised Sheldon Cooper Primes
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Aug
3
revised What is the symbol for primes?
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Aug
1
revised Colleague Matrix
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Aug
1
answered Colleague Matrix
Jul
31
revised Why the SVD is named so…
added 50 characters in body
Jul
31
comment Analytical approximation of integral of Bessel function
@Raymond, I pop up every so often here, yes, but sadly not as much as before. Yes, that was the answer I had in mind. :)
Jul
31
revised How to solve this definite Integral containing $E_{1}${.}!
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Jul
31
comment Analytical approximation of integral of Bessel function
For numerics, you can use a particular integral representation of the Bessel function that can be efficiently evaluated with the trapezoidal rule. I've posted this on this site some time in the past; search around.
Jul
31
revised Fast multipole method: help on tutorial
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Jul
30
awarded  Nice Answer
Jul
29
revised Why is it that the Lambert W relation cannot be expressed in terms of elementary functions?
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Jul
29
awarded  Yearling