Andrey Rekalo
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 Dec1 revised Get $\pi$ decimals manually added 157 characters in body Nov10 revised Intuitive explanation of a positive-semidefinite matrix added 8 characters in body; added 9 characters in body; deleted 4 characters in body; deleted 1 characters in body Nov10 revised $\frac{\mathrm d^2 \log(\Gamma (z))}{\mathrm dz^2} = \sum\limits_{n = 0}^{\infty} \frac{1}{(z+n)^2}$ added 343 characters in body Nov9 revised Suggesting closed-form representations of mathematical constants by means of experimental mathematics? Formula corrected. Nov9 revised Suggesting closed-form representations of mathematical constants by means of experimental mathematics? added 190 characters in body; added 8 characters in body Nov8 revised Comparing $\pi^{e}$ and $e^{\pi}$ edited tags Nov8 revised Comparing $\pi^{e}$ and $e^{\pi}$ added 27 characters in body Nov8 revised Comparing $\pi^{e}$ and $e^{\pi}$ added 12 characters in body Nov7 revised two-body problem circular orbits edited tags Nov7 revised Proving $\int_{0}^{\infty} \mathrm{e}^{-x^2} dx = \dfrac{\sqrt \pi}{2}$ added 30 characters in body Nov7 revised Proving $\int_{0}^{\infty} \mathrm{e}^{-x^2} dx = \dfrac{\sqrt \pi}{2}$ added 5 characters in body Nov7 revised Proving $\int_{0}^{\infty} \mathrm{e}^{-x^2} dx = \dfrac{\sqrt \pi}{2}$ added 152 characters in body Nov5 revised Compute $\lim\limits_{a \to 0^+} \left(a \int_1^{\infty} e^{-ax}\cos \left(\frac{2\pi}{1+x^{2}} \right)\,\mathrm dx\right)$ edited tags Nov4 revised Volume bounded by cylinders $x^2 + y^2 = r^2$ and $z^2 + y^2 = r^2$ added 70 characters in body Nov4 revised Volume bounded by cylinders $x^2 + y^2 = r^2$ and $z^2 + y^2 = r^2$ added 72 characters in body; added 3 characters in body Nov3 revised Different methods to compute $\sum\limits_{n=1}^\infty \frac{1}{n^2}$ deleted 2 characters in body Nov3 revised Next term in $(1+a/n)^n \rightarrow \exp (a)$ added 98 characters in body Nov2 revised Eigenvalues and Eigenvectors of $2 \times 2$ Matrix added 277 characters in body Nov2 revised What is an example of a second order differential equation for which it is known that there are no smooth solutions? added 163 characters in body Nov2 revised What is an example of a second order differential equation for which it is known that there are no smooth solutions? added 13 characters in body