Guess who it is.
Reputation
48,110
Next tag badge:
112/100 score
19/20 answers
Badges
5 96 223
Newest
Impact
~1.7m people reached

• 340 helpful flags
• 11,588 votes cast

# 17,671 Actions

 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 edited tags Aug 3 revised What is the symbol for primes? edited tags Aug 1 revised Colleague Matrix edited tags 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 $E_{1}${.}! edited tags 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 edited tags Jul 30 awarded Nice Answer Jul 29 revised Why is it that the Lambert W relation cannot be expressed in terms of elementary functions? edited tags Jul 29 awarded Yearling