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 Feb17 asked Graph generated by Voronoi diagrams Apr14 asked Introductory book about economic models with deterministic chaos May10 asked Does $\operatorname{MSE}(\hat{\theta}) = \operatorname{Var}(\theta)+ \left(\operatorname{Bias}(\hat{\theta},\theta)\right)^2$? Mar20 asked Is there efficient way of finding last number in following sequence Mar19 asked For which minimal $k$ true is that ${4}^{k}\cdot n\leq \displaystyle\sum^{n}_{i=1}{a}_{i}^{k}\leq {5}^{k}\cdot n$, ${a}_{i}\in {1,2,3,4,5,6}$? Mar19 asked What is sum of occurrences of zeros, at the end of integers, up to number $n$? Mar11 asked Checking Sudoku - sufficient sums Mar6 asked Are there any Heron-like formulas for convex polygons? Feb25 asked Is the Fujiwara bound the most precise bound on maximum absolute value of complex roots of real polynomials? Feb22 answered Might such a sequence of mathematical expectations be able to predict uncertain events? Feb21 asked What is closed-form expression for $F(n)$ when $F(n)=F(n-1)+F(n-2)$ and $F(0)=a$,$F(1)=b$ and $a,b>0$? Feb13 asked What is the distribution of empirical covariance between two independent normal distributions? Jan28 asked $u$~$N(0,A)$ and z$|u$~$N(u,1)$ how to show that $u|z$~$N(Bz,B)$ where $B=A/(A+1)$? Jan27 asked How to obtain estimate of covariance matrix that will be guarantee to be semi-positive define? Jan23 asked Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. Aug8 asked What is the sum of $\sum\limits_{i=1}^{n}i^k p^i$? Aug8 asked What is the sum of $\sum\limits_{i=1}^{n}ip^i$? Jul20 asked What is $f(t)=X_{t+1}$, if $X_{t+1}=(1-p)(1-X_{t})+pX_{t}$ and $X_{0},p \in [0,1]$? May17 asked What is the number of functions $f : A\rightarrow A, \forall_{x\in{A}} f(f(x))=x$, set $A$ have $n$ distinct elements. May14 asked Is $M=\{(x,y)\in (0,\infty )\times\mathbb{R} : y=\sin(\frac{1}{x}) \}$ a closed set in space $((0,\infty )\times\mathbb{R} ,\rho_{e})$?