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seen Apr 29 '13 at 17:50

Jul
2
awarded  Curious
May
17
awarded  Popular Question
Apr
7
comment Given a random sequence give a recurrence defining it.
Might this be possible with some application of interpolants?
Mar
29
accepted Simplifying formula with Laplacians
Mar
29
asked Is $\langle f \rangle $ an “inner product”?
Mar
5
asked Integral of expression including partial derivatives
Mar
4
asked Simplifying formula with Laplacians
Feb
11
asked Calculating particle paths for a two-dimensional flow
Dec
17
awarded  Promoter
Dec
15
asked Proof of a lower bound of the norm of an arbitrary monic polynomial
Nov
25
comment Electric dipole potential (Taylor expansion)
thank you for all your help, cleared it up a lot!
Nov
25
accepted Electric dipole potential (Taylor expansion)
Nov
25
comment Electric dipole potential (Taylor expansion)
I know how to obtain the Taylor expansion of that. From your answer the lecturer neglects the $s^2$ term since $s\to 0$, then takes out a common factor or $\dfrac{e}{r}$ to get $-\dfrac{e}{r} (-1 + \dfrac{1}{\sqrt{1- \dfrac{2xs}{r}}})$. I understand how to get here, but then the lecturer rearranges this to obtain $\dfrac{e}{r}\left[ -1 + (1+\dfrac{xs}{r^2})\right]$. This bemuses me.
Nov
25
comment Electric dipole potential (Taylor expansion)
Ah, I see, so that's not the Taylor expansion at all. The Taylor expansion must come in the line she writes after this (sorry, was confused about this, don't see why she had to write ellipsis so presumed that was the expansion!). Please see my edit.
Nov
25
revised Electric dipole potential (Taylor expansion)
added 138 characters in body
Nov
25
asked Electric dipole potential (Taylor expansion)
Nov
23
awarded  Tumbleweed
Nov
19
asked Interpolating polynomial with Chebyshev nodes
Nov
16
accepted Matrix of a linear transformation (notation)
Oct
23
accepted Finding the integral of a product of exp and cosine