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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
Related: mathoverflow.net/questions/122411/…
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 $b_3/g_3=r_3<1$)