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seen Jun 24 '13 at 0:06

No, his mind is not for rent
to any god or government.
Always hopeful, yet discontent.
He knows changes aren't permanent,
but change is.

— Rush, Tom Sawyer


Taking an externally-imposed and much-needed break from SE activities.

E-mail (flipped ROT13): zqd˙ʎʌuzʇ@ʇɐʌǝɥʇʌssqɹǝɥɟuɹʎɔ
Any code I've posted here I place under the WTFPL.


Sep
30
revised Second order Taylor method to solve system of equations
edited tags
Sep
30
comment Differences in Quaternion properties?
Unless you have some new way of modifying the famed formula of Euler, I see no way to make something out of your second equation.
Sep
29
revised How to show a set is convex
edited tags
Sep
29
comment How do I combine “error of order” terms in numerical analysis?
All fixed, thanks for the corrections @Hans.
Sep
29
revised How do I combine “error of order” terms in numerical analysis?
errors fixed, thanks to Hans
Sep
29
comment How do I combine “error of order” terms in numerical analysis?
@Hans: there, fixed. I seem to have been thinking of something else while I wrote the first version of this answer. :) Thanks for the heads-up!
Sep
29
revised How do I combine “error of order” terms in numerical analysis?
actual answer
Sep
29
comment Napier's Rules applied to spherical distance calculations
@JavadocMD: You'll sometimes see "The shortest distance along the surface of a sphere between two points is along the great circle through those two points" stated instead as "segments of great circles are geodesics on a sphere."
Sep
29
comment How closely can we estimate $\sum_{i=0}^n \sqrt{i}$
What have you tried so far?
Sep
29
revised How do I combine “error of order” terms in numerical analysis?
additional info
Sep
29
comment Napier's Rules applied to spherical distance calculations
Correction to that last comment of mine: all the meridians/longitudes are great circles, but among the latitudes, only the equator is a great circle.
Sep
29
comment Napier's Rules applied to spherical distance calculations
Yes, the Napier formulae are meant only for spherical triangles, triangles whose sides are arcs of great circles. Remember that only the equator and the prime meridian are the great circles on the globe.
Sep
29
comment Generalizing values which Euler's-totient function does not take
In general, when you encounter some sequence of integers in your work, it is always a good idea to look first at OEIS; the refs there usually provide interesting leads.
Sep
29
answered How do I combine “error of order” terms in numerical analysis?
Sep
29
comment Image of sin(z) over a complex set
Hans, those pics look awesome. May I know what you used to plot these?
Sep
28
comment Factoring a Cubic Polynomial
Cardano is a bit of a sledgehammer here; the only other thing I'll note is that synthetic division may be more convenient than long division, depending on the user.
Sep
28
answered WolframAlpha Returns only 2 Roots for a Polynomial Equation of 6 Degree
Sep
28
comment WolframAlpha Returns only 2 Roots for a Polynomial Equation of 6 Degree
It's actually a decic (tenth-degree) that you have; with two roots of multiplicity 5.
Sep
28
comment Solve cryptogram - ciphertext given
Well, that too... wow, has it really been that long ago? I guess I'm getting old. :D
Sep
27
comment Solve cryptogram - ciphertext given
Up to 3 blocks... okay, it is dated, but it still looks interesting.