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 Sep 1 awarded Yearling May 21 comment Chi-Square Computations stats.stackexchange.com/questions/121662/… Mar 15 revised Prove that there exists a choice of $\pm$ signs deleted 4 characters in body Mar 14 answered Prove that there exists a choice of $\pm$ signs Mar 13 comment Evaluating the integral $\int \frac{1}{x+ \text{ ln }(x)}dx$ wolframalpha.com/input/… Mar 13 comment The formula of Eclidean distance to a hyperplane. If you consider $H$ as a hyperplane in $\mathbb{R}^{mn}$ and $X$ and $Y$ are two coordinates (i.e. $X,\,Y\in\mathbb{R}$), then $mn$ real numbers, not just $X$ and $Y$, are necessary to specify a point in $\mathbb{R}^{mn}$. Mar 12 answered Positive numbers inequality Mar 12 comment Weaker version of the A.M.-G.M. inequality Mar 12 comment Positive numbers inequality The above answer can be rescued if you show $\sum iy_i\ge \sum i\cdot\frac1n$ when $0< y_1\le y_2\le \cdots \le y_n$ and $y_1+\cdots+y_n=1$. Mar 11 comment Positive numbers inequality Where did you use $y_1\le y_2\le \cdots \le y_n$? and why is $\left(\frac2{n(n+1)}\sum y_i\right)^{\log_2 3}\ge \frac1{n^2}$ (the last inequality)? Feb 17 comment prove that $f_n = 37111111…111$ is never prime Try Factor[371], Factor[3711], Factor[37111] etc. (up to $n=10$) with WolframAlpha. Feb 13 comment Model a chemical phenomenom Yes, periodic boundary conditions are often used in mathematical / physical modeling and are a good starting point. Feb 12 comment Model a chemical phenomenom I think the lattice should reflect the actual shape of the receptor, but you could start with a rectangle (if it's 2D) or a cuboid (if it's 3D). Feb 11 answered Model a chemical phenomenom Feb 10 comment Express $\binom{n+2}{k}$ according to $\binom{n}{k}$ Similar question: math.stackexchange.com/questions/649567/… Feb 9 awarded Informed Feb 9 answered Showing the “only if” direction of equality in a complex equality Feb 6 answered A reccurent sequence Feb 5 revised Find one solution for system of inequalities (if exits) deleted 194 characters in body Feb 5 comment Hard inequality with conditions Then you can construct a counterexample easily, following the above argument. (such as in the case $b_2/g_2=r_2>1$ and $b_3/g_3=r_3<1$)