Skip to main content
Mathematics
robjohn's user avatar
robjohn's user avatar
robjohn's user avatar
robjohn
Moderator
  • Member for 14 years, 9 months
  • Last seen this week
  • none
  • West Hills, CA
Profile Activity

Stats

356,742
reputation
20.2m
reached
7,322
answers
5
questions
Communities
View all

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

Badges

View all badges
39
gold badges
501
silver badges
898
bronze badges

Top tags

View all tags
7,930
Score
1,377
Posts
19
Posts %
5,919
Score
1,123
Posts
15
Posts %
4,939
Score
900
Posts
12
Posts %
4,686
Score
994
Posts
14
Posts %
3,604
Score
716
Posts
10
Posts %
2,677
Score
381
Posts
5
Posts %

Top posts

View all questions and answers
678
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
155
Slice of pizza with no crust
Sep 1, 2013
154
How to prove that $\frac{\zeta(2) }{2}+\frac{\zeta (4)}{2^3}+\frac{\zeta (6)}{2^5}+\frac{\zeta (8)}{2^7}+\cdots=1$?
Dec 24, 2014
132
Parabola is an ellipse, but with one focal point at infinity
May 2, 2014
116
How to sum this series for $\pi/2$ directly?
Oct 31, 2011
106
Is it possible to represent every irrational number as a (limit of) an infinite sum of rational numbers?
Oct 6, 2015
95
Is there any integral for the Golden Ratio?
Feb 14, 2016
94
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
90
Arc length contest! Minimize the arc length of $f(x)$ when given three conditions.
Feb 4, 2015

Top Meta posts

23
203
134
Should chat have TeX support?
132
General Moderation Strike: Mathematics StackExchange moderators are participating
120
Main Chatroom Guidelines
62
Someone with more rep than you is wrong?
49
Answers with $0$ votes.

Top network posts

View all network posts
39
MathJax CDN (cdn.mathjax.org) will be shutting down
22
Drawing Rotated views while ignoring the Bounding box
12
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