Mathematics
robjohn's user avatar
robjohn's user avatar
robjohn's user avatar
robjohn
Moderator
  • Member for 11 years, 8 months
  • Last seen this week
  • none
  • West Hills, CA
Profile Activity
Stats
334,120
reputation
16.4m
reached
7,217
answers
5
questions
top 0.02% overall
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
34
gold badges
444
silver badges
822
bronze badges
Top tags
View all tags
7,285
Score
1,353
Posts
19
Posts %
5,469
Score
1,094
Posts
15
Posts %
4,521
Score
884
Posts
12
Posts %
4,363
Score
966
Posts
13
Posts %
3,389
Score
704
Posts
10
Posts %
2,471
Score
372
Posts
5
Posts %
Top posts
View all questions and answers
All Questions Answers
Score Newest
answer
628
How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?
Oct 23, 2011
answer
177
What's 4 times more likely than 80%?
Aug 12, 2013
answer
150
Slice of pizza with no crust
Sep 1, 2013
answer
141
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
answer
127
Parabola is an ellipse, but with one focal point at infinity
May 2, 2014
question
111
How to sum this series for $\pi/2$ directly?
Oct 31, 2011
answer
102
Is it possible to represent every irrational number as a (limit of) an infinite sum of rational numbers?
Oct 6, 2015
answer
91
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
answer
87
Is there any integral for the Golden Ratio?
Feb 14, 2016
answer
87
Arc length contest! Minimize the arc length of $f(x)$ when given three conditions.
Feb 4, 2015
Top Meta posts
22
200
132
Should chat have TeX support?
118
Main Chatroom Guidelines
61
Someone with more rep than you is wrong?
49
Answers with $0$ votes.
44
Would a tag for "check-my-proof" questions be useful?
Top network posts
View all network posts
39
MathJax CDN (cdn.mathjax.org) will be shutting down
21
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

Your privacy

By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy.