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robjohn
  • Member for 7 years, 11 months
  • Last seen more than a week ago
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  • 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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601
How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?
176
What's 4 times more likely than 80%?
147
Slice of pizza with no crust
137
How to prove that $\frac{\zeta(2) }{2}+\frac{\zeta (4)}{2^3}+\frac{\zeta (6)}{2^5}+\frac{\zeta (8)}{2^7}+\cdots=1$?
123
Parabola is an ellipse, but with one focal point at infinity

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