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Mathematics
Mark Eichenlaub's user avatar
Mark Eichenlaub's user avatar
Mark Eichenlaub's user avatar
Mark Eichenlaub
  • Member for 15 years, 5 months
  • Last seen more than a week ago
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About

I write physics courses at focused on problem solving at Art of Problem Solving. They range from introductory algebra-based courses to physics olympiad preparation.

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Top posts

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453
Fourier transform for dummies
Oct 14, 2011
322
Find five positive integers whose reciprocals sum to $1$
Jan 31, 2013
90
What am I doing when I separate the variables of a differential equation?
Mar 16, 2011
48
Why does a circle enclose the largest area?
Mar 10, 2011
40
Why isn't the gamma function defined so that $\Gamma(n) = n! $?
Jan 20, 2011
40
Why is Euclidean geometry scale-invariant?
Feb 21, 2011
28
What is an intuitive explanation for $\operatorname{div} \operatorname{curl} F = 0$?
Mar 14, 2011
19
What are the polar coordinates of the origin?
Apr 13, 2011
14
Why can't we interchange differentiation with taking a limit of a series of functions?
Sep 15, 2011
13
An ant walk on the edges of a cube where it can select any of the 3 adjoining vertices with equal probability.
Mar 20, 2011

Top network posts

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294
Why are mirror images flipped horizontally but not vertically?
135
Why doesn't the Moon fall onto the Earth?
126
Why am I not burned by a strong wind?
125
Is Earth really a magnet?
94
Why does the atmosphere rotate along with the earth?