Mark Eichenlaub
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 Nov25 comment Point me the primordial and intuitive concepts about this operations on physics what are a, b, and c? It doesn't look like you ever defined them. Nov18 comment Fourier-like expansion of a closed curve in 2D demonstration: youtube.com/watch?v=QVuU2YCwHjw Nov18 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.) Nov9 awarded Yearling Oct14 answered Fourier transform for dummies Oct11 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". Oct11 awarded Nice Question Sep15 asked Why can't we interchange differentiation with taking a limit of a series of functions? Aug5 awarded Necromancer Apr20 accepted What are the polar coordinates of the origin? Apr14 awarded Nice Question Apr14 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? Apr14 comment What are the polar coordinates of the origin? @Qiochu Thanks. How about derivatives? Apr13 asked What are the polar coordinates of the origin? Apr1 comment How to show $\arcsin{x} = \frac{\pi}{2} + i \ln{(x+\sqrt{x^2-1})}$? meaningful titles would also be helpful Apr1 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 Apr1 answered Find max/minima of $x\sqrt{16-x^{2}}$ Mar28 accepted Is there a geometric interpretation of the exponential function of real numbers? Mar25 accepted What are the 2125922464947725402112000 symmetries of a Rubik's Cube? Mar25 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).