robjohn♦
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The Mean Square
(with one standard deviation and several unusual ones)
aka Rob Johnson
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- 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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