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robjohn
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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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653
How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?
Oct 23, 2011
177
What's 4 times more likely than 80%?
Aug 12, 2013
151
Slice of pizza with no crust
Sep 1, 2013
147
How to prove that $\frac{\zeta(2) }{2}+\frac{\zeta (4)}{2^3}+\frac{\zeta (6)}{2^5}+\frac{\zeta (8)}{2^7}+\cdots=1$?
Dec 24, 2014
130
Parabola is an ellipse, but with one focal point at infinity
May 2, 2014
115
How to sum this series for $\pi/2$ directly?
Oct 31, 2011
105
Is it possible to represent every irrational number as a (limit of) an infinite sum of rational numbers?
Oct 6, 2015
93
Proving an alternating Euler sum: $\sum_{k=1}^{\infty} \frac{(-1)^{k+1} H_k}{k} = \frac{1}{2} \zeta(2) - \frac{1}{2} \log^2 2$
Sep 20, 2013
89
Arc length contest! Minimize the arc length of $f(x)$ when given three conditions.
Feb 4, 2015
89
Is there any integral for the Golden Ratio?
Feb 14, 2016
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Should chat have TeX support?
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General Moderation Strike: Mathematics StackExchange moderators are participating
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Main Chatroom Guidelines
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Someone with more rep than you is wrong?
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Answers with $0$ votes.
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MathJax CDN (cdn.mathjax.org) will be shutting down
21
Drawing Rotated views while ignoring the Bounding box
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Why is there a discrepancy between JoinedCurve/FilledCurve and the underlying BSplineCurve segments?
10
Amazon logo in oneboxed Amazon links is pixelated
10
About an infinite product