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visits member for 3 years, 8 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.


Jun
17
revised Helicoid and Catenoid
edited tags
Jun
17
comment Mathematica: How to convert scales to frequencies?
To those voting to close: this topic is too old to be migrated anymore; go easy, y'all.
Jun
17
revised multiplication in GF(256) (AES algorithm)
edited tags; edited tags
Jun
15
revised Proving $\|e^A\|\le e^{\|A\|}$
edited title
Jun
14
awarded  linear-algebra
Jun
13
comment Help find hard integrals that evaluate to $59$?
Ah, shoot; let me look for my notes on this... if memory serves, I trolled through OEIS and looked for generating functions.
Jun
12
revised Local maxima of Legendre polynomials
edited tags
Jun
12
revised Solutions of $n$th derivative of $(x-a)^n(x-b)^n=0$
deleted 42 characters in body
Jun
12
comment Parallel to line on $f(x)=1+\sin(x)/x$
Well, since the discontinuity at $0$ is of the removable kind, I went ahead and defined the value of the function at $0$ to be the same as the value of an appropriate limit. Or, did you not tackle that limit while learning calculus?
Jun
12
revised Parallel to line on $f(x)=1+\sin(x)/x$
edited tags
Jun
12
comment Parallel to line on $f(x)=1+\sin(x)/x$
...the function you were asking about. What else could it have been?
Jun
12
comment Any four points on the space curve given by the parametrization $(t,t^2,t^3)$ are noncolinear
After noting that the matrix is Vandermonde, recall particular conditions on the rows for a matrix to be singular. Interpret geometrically.
Jun
12
revised An inequality from Littlewood's Miscellany
edited tags
Jun
12
revised Is $x^x=y$ solvable for $x$?
added 18 characters in body
Jun
12
revised Solve $x^x = a$ for known $a$?
added 3 characters in body
Jun
11
revised Modular Arithmetic Calendars
edited tags
Jun
11
revised Are there prime lengths in triangle with all integer sides and heights?
edited tags
Jun
11
revised Higher Dimenional Tic Tac Toe
edited tags
Jun
11
revised My sister absolutely refuses to learn math
added 8 characters in body
Jun
11
comment My sister absolutely refuses to learn math
@Kolyunya, " She probably wants to become an artist or something" so, ratio and proportions aren't important to artists? How about geometry? I'm not even counting those people who use actual math to make sculptures, e.g. Bathsheba Grossman or George Hart.