robjohn
The Mean Square
(with one standard deviation and several unusual ones)
aka Rob Johnson
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West Hills, CA
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Member for 7 years
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1 profile view
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Last seen Jan 18 at 14:42
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Top network posts
- 568 How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$?
- 176 What's 4 times more likely than 80%?
- 143 Slice of pizza with no crust
- 128 How to prove that $\frac{\zeta(2) }{2}+\frac{\zeta (4)}{2^3}+\frac{\zeta (6)}{2^5}+\frac{\zeta (8)}{2^7}+\cdots=1$?
- 120 Parabola is an ellipse, but with one focal point at infinity
- 108 How to sum this series for $\pi/2$ directly?
- 84 Proving an alternating Euler sum: $\sum_{k=1}^{\infty} \frac{(-1)^{k+1} H_k}{k} = \frac{1}{2} \zeta(2) - \frac{1}{2} \log^2 2$
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