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visits member for 4 years
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.


Oct
2
comment The WKB method: motivation
Short version: because the Airy function is the simplest function with a "turning point" that is "well-studied" enough, that we look at how we can (locally) approximate solutions to more complicated differential equations with Airy.
Oct
2
revised Implicit function $y = e^{(y-1)/x}$
additions
Oct
2
comment Finding a line that satisfies three conditions
In English: find the line parallel to $\mathbb{L}_1$ that crosses the other two given lines.
Oct
2
revised Finding a line that satisfies three conditions
edited tags
Oct
2
comment Extension of previous problem, involving $\ell^p$ norm circles
If I'm understanding what you want to do correctly, why can't you just subtract the total area of one Lamé curve from another?
Oct
2
comment Explanation of method for showing that 0 / 0 is undefined
@Talvi: commutativity is a property of operators (e.g. addition, multiplication), not of objects like ∞.
Oct
2
revised How is done the calculation of the minimum number of movement to solve any configuration of Rubik's Cube?
edited tags
Oct
2
revised Intersection of Cubic curves
edited tags
Oct
2
answered Implicit function $y = e^{(y-1)/x}$
Oct
1
revised Some basic questions about the Selberg zeta function
Selberg is not yet in Abel's league, per Mariano. ;)
Oct
1
comment How do I plot this red dot?
But you have an algorithm... that would give information that can be just as valuable as (if not more so) the series of pictures you have.
Oct
1
comment Does the following function have a name and what properties does it have?
What you're asking for in (1) looks like a flipped ramp function. I don't think this is what you really want, though.
Oct
1
revised How many disconnected graphs of the Rubik's cube exist?
"Rubik" is a proper noun.
Oct
1
comment Simple algorithm effectiveness (Least-Squares Regression Line in Terms of Sample Variances)
Here is an article you might want to peruse regarding the matter.
Oct
1
comment Simple algorithm effectiveness (Least-Squares Regression Line in Terms of Sample Variances)
The short version of what that commenter said is that it takes more effort to compute the variance with the first formula. It is however more accurate than the second formula; the second formula may be faster, but it is more prone to losing significant figures.
Oct
1
answered Simple algorithm effectiveness (Least-Squares Regression Line in Terms of Sample Variances)
Oct
1
awarded  Enlightened
Oct
1
comment Scaling at an arbitrary point and figuring out the distance from origin
What's the real problem that you have, @hyn?
Oct
1
comment Scaling at an arbitrary point and figuring out the distance from origin
What do you mean by "anchor point"? Should the newly scaled rectangle have a corner at that point, or should it be centered there?
Sep
30
comment Second order Taylor method to solve system of equations
Actually, what I was getting at is that there's one question you have to ask first: "how does one 'invert' a rank-3 tensor?"