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robjohn

West Hills, CA

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

aka Rob Johnson

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Top Questions
108 votes

How to sum this series for $\pi/2$ directly?

sequences-and-series pi asked Oct 31 '11 at 19:17
math.stackexchange.com

39 votes

MathJax CDN (cdn.mathjax.org) will be shutting down

support mathjax asked Apr 1 '17 at 17:59
meta.stackexchange.com

21 votes

Drawing Rotated views while ignoring the Bounding box

graphics asked Mar 3 '12 at 19:13
mathematica.stackexchange.com

14 votes

Asymptotic Expansion for $\frac1{2^n}\sum_{k=1}^n\frac1{\sqrt{k}}\binom{n}{k}$

probability asymptotics binomial-distribution asked May 31 '19 at 16:19
math.stackexchange.com

11 votes

Why is there a discrepancy between JoinedCurve/FilledCurve and the underlying BSplineCurve segments?

graphics splines asked Oct 31 '20 at 20:44
mathematica.stackexchange.com

9 votes

rotational oblateness

newtonian-gravity rotational-dynamics geophysics asked Jun 29 '13 at 20:43
physics.stackexchange.com

7 votes

Cannot Get Numerical Results to Match

numerical-integration special-functions accuracy precision asked Mar 16 '13 at 0:23
mathematica.stackexchange.com

7 votes

Why does $\tan(30^{\large\circ})=\frac{\tan(10^{\large\circ})\tan(50^{\large\circ})}{\tan(20^{\large\circ})}$?

trigonometry asked Apr 29 '20 at 6:14
math.stackexchange.com

6 votes

Texture prevents JoinedCurve from closing

graphics bugs splines filling textures asked Feb 2 at 14:29
mathematica.stackexchange.com

5 votes

Restoring previous “Save Selection As…” behavior

front-end save dialog-window asked Nov 14 '19 at 3:27
mathematica.stackexchange.com

1 2

Top Answers
568
How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?
math.stackexchange.com

176
What's 4 times more likely than 80%?
math.stackexchange.com

143
Slice of pizza with no crust
math.stackexchange.com

128
How to prove that $\frac{\zeta(2) }{2}+\frac{\zeta (4)}{2^3}+\frac{\zeta (6)}{2^5}+\frac{\zeta (8)}{2^7}+\cdots=1$?
math.stackexchange.com

120
Parabola is an ellipse, but with one focal point at infinity
math.stackexchange.com

99
Is it possible to represent every irrational number as a (limit of) an infinite sum of rational numbers?
math.stackexchange.com

84
Proving an alternating Euler sum: $\sum_{k=1}^{\infty} \frac{(-1)^{k+1} H_k}{k} = \frac{1}{2} \zeta(2) - \frac{1}{2} \log^2 2$
math.stackexchange.com

83
Is there any integral for the Golden Ratio?
math.stackexchange.com

82
Arc length contest! Minimize the arc length of $f(x)$ when given three conditions.
math.stackexchange.com

75
Computing $\zeta(6)=\sum\limits_{k=1}^\infty \frac1{k^6}$ with Fourier series.
math.stackexchange.com

75
Can an infinite sum of irrational numbers be rational?
math.stackexchange.com

70
Is it possible to write a sum as an integral to solve it?
math.stackexchange.com

65
Evaluating $\int_0^\infty \sin x^2\, dx$ with real methods?
math.stackexchange.com

59
A closed form of $\int_0^\infty\frac{\sqrt[\phi]{x}\ \arctan x}{\left(x^\phi+1\right)^2}dx$
math.stackexchange.com

57
Why is $i^3$ (the complex number “$i$”) equal to $-i$ instead of $i$?
math.stackexchange.com

56
How to evaluate $I=\int_0^{\pi/2}x^2\ln(\sin x)\ln(\cos x)\ \mathrm dx$
math.stackexchange.com

56
Evaluating $\lim\limits_{n\to\infty} e^{-n} \sum\limits_{k=0}^{n} \frac{n^k}{k!}$
math.stackexchange.com

54
Why does $1+2+3+\cdots = -\frac{1}{12}$?
math.stackexchange.com

53
Trivial zeros of the Riemann Zeta function
math.stackexchange.com

53
Generalized Euler sum $\sum_{n=1}^\infty \frac{H_n}{n^q}$
math.stackexchange.com

52
In which cases is the inverse of a matrix equal to its transpose?
math.stackexchange.com

52
I have a problem understanding the proof of Rencontres numbers (Derangements)
math.stackexchange.com

52
Coin flipping probability game ; 7 flips vs 8 flips
math.stackexchange.com

52
Linear diophantine equation $100x - 23y = -19$
math.stackexchange.com

52
Curious Integral Proof
math.stackexchange.com

51
How to prove a trigonometric identity $\tan(A)=\frac{\sin2A}{1+\cos 2A}$
math.stackexchange.com

51
Are all limits solvable without L'Hôpital Rule or Series Expansion
math.stackexchange.com

49
Find the simplest counterexample against exchanging limit and summation
math.stackexchange.com

49
Why can the complex conjugate of a variable be treated as a constant when differentiating with respect to that variable?
math.stackexchange.com

48
How do you prove Gautschi's inequality for the gamma function?
math.stackexchange.com

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