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robjohn's user avatar
robjohn's user avatar
robjohn
  • Member for 13 years, 11 months
  • Last seen more than a month ago
  • West Hills, CA
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About

the mean square The Mean Square
(with one standard deviation and several unusual ones)

aka Rob Johnson

$\LaTeX$ support for Chat

ChatJax installer

Some of my astrophotos

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Top posts

10
What is happening when magnetic field lines snap or break?
Jun 22, 2020
9
Rotational oblateness
Jun 29, 2013
4
Blue-shifting as opposed to violet-shifting
Dec 11, 2012
4
What does this quote about the four dimensional divergence of an antisymmetric tensor mean?
Jan 21, 2013
3
High school double lens optics question
May 18, 2012

Top network posts

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678
How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?
177
What's 4 times more likely than 80%?
155
Slice of pizza with no crust
154
How to prove that $\frac{\zeta(2) }{2}+\frac{\zeta (4)}{2^3}+\frac{\zeta (6)}{2^5}+\frac{\zeta (8)}{2^7}+\cdots=1$?
132
Parabola is an ellipse, but with one focal point at infinity