Mark Eichenlaub

2,191 reputation

1620

bio	website	arcsecond.wordpress.com
	location	Baltimore, MD
	age	28
visits	member for	2 years, 6 months
	seen	yesterday
stats	profile views	273

I'm a physics graduate student.

	2,191 reputation	bio	website	arcsecond.wordpress.com	visits	member for	2 years, 6 months
1620 badges		location	Baltimore, MD		seen	yesterday

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Nov 18	comment	Fourier-like expansion of a closed curve in 2D We can also think of it as just a usual complex-valued Fourier transform, since complex numbers can represent two dimensions. (I now see that Greg P pointed this out in the comments to the main question.)
Nov 9	awarded	Yearling
Oct 14	answered	Fourier transform for dummies
Oct 11	comment	What is an example of an application of a higher order derivative ($y^{(n)}$, $n\geq 4$)? I've heard 4th, 5th, and 6th derivatives called "snap", "crackle", and "pop".
Oct 11	awarded	Nice Question
Sep 15	asked	Why can't we interchange differentiation with taking a limit of a series of functions?
Aug 5	awarded	Necromancer
Apr 20	accepted	What are the polar coordinates of the origin?
Apr 14	awarded	Nice Question
Apr 14	comment	What are the polar coordinates of the origin? I don't completely understand your answer. Can you give an example of a function discontinuous at the origin as you were mentioning, please?
Apr 14	comment	What are the polar coordinates of the origin? @Qiochu Thanks. How about derivatives?
Apr 13	asked	What are the polar coordinates of the origin?
Apr 1	comment	How to show $\arcsin{x} = \frac{\pi}{2} + i \ln{(x+\sqrt{x^2-1})}$? meaningful titles would also be helpful
Apr 1	revised	Find max/minima of $x\sqrt{16-x^{2}}$ added 135 characters in body; added 34 characters in body; deleted 165 characters in body
Apr 1	answered	Find max/minima of $x\sqrt{16-x^{2}}$
Mar 28	accepted	Is there a geometric interpretation of the exponential function of real numbers?
Mar 25	accepted	What are the 2125922464947725402112000 symmetries of a Rubik's Cube?
Mar 25	comment	What are the 2125922464947725402112000 symmetries of a Rubik's Cube? @Joriki Thank you, but doesn't that give the wrong number? The size of the Rubik's cube group is 4*10^19 (en.wikipedia.org/wiki/Rubik's_cube_group).
Mar 25	asked	Is there a geometric interpretation of the exponential function of real numbers?
Mar 25	asked	What are the 2125922464947725402112000 symmetries of a Rubik's Cube?