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visits member for 3 years, 9 months
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
4
answered Graphing a Parametric Polynomial based on a given set of points
Oct
4
comment Fitting a parameter dependent matrix to its eigenvalues
I don't see the relation. Where are the $M_i$ from?
Oct
4
comment Fitting a parameter dependent matrix to its eigenvalues
Hmm, an inverse eigenvalue problem? Usually more structure is asked of a matrix than being merely Hermitian (e.g. tridiagonal, Toeplitz). What sort of parameters are these? Do you have a "toy problem" that illustrates what you're expecting to see?
Oct
4
revised How to prove an identity in radicals?
edited title
Oct
4
comment Graphing a Parametric Polynomial based on a given set of points
Do the points represent an arbitrary curve, or a function? I.e., would a curve drawn through your points satisfy a vertical-line test?
Oct
4
revised is there a name for this construction? (taking a pairing and obtaining a perfect one)
edited tags
Oct
4
revised Dimensional Analysis
edited tags
Oct
4
comment Lateral surface area by hand
A generally useful check: if you have a tentative antiderivative, differentiate that and verify that the expression you have is identical to your original integrand.
Oct
3
comment $\$10$ and $\$100$ bill equation
The machinery for solving linear Diophantine equations isn't even needed here, thankfully. :) Simply solving the two equations in two unknowns works.
Oct
3
comment Integral solutions to $y^{2}=x^{3}-1$
He's saying that integers of the form $y^2+1$ can be represented as a product of two Gaussian integers, $y+i$ and $y-i$, where $i$ is the usual imaginary unit.
Oct
3
comment Link between time and complex amplitude argument, DFT
Why not ask your teacher? There's a lot you can do (e.g. spectrograms), and it's not entirely clear what you (or your teacher, as it seems) are expecting to see from what you've written.
Oct
3
comment For all w, CDF of y at w is greater than the CDF of x at w. Prove that the probability ( y < x ) >= 0.5
What distribution are we talking about here?
Oct
3
comment Problem with binomial coefficients
It's a bit of a cheat, but $\binom{m}{n}$ for $m < n$ is 0 because the reciprocal gamma function (and thus the reciprocal factorial) is zero at the negative integers.
Oct
3
revised Integral solutions to $y^{2}=x^{3}-1$
edited tags
Oct
3
comment geometry and topology
"geometric topology has some characteristics of a grumpy old man who is really set on figuring out something specific." - Awesome, now I won't be able to get that image out of my head. Thanks! ;)
Oct
3
comment Finding a line that satisfies three conditions
Wow, the box product makes everything tidy! :D
Oct
2
revised Implicit function $y = e^{(y-1)/x}$
correction
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.