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 Apr 25 asked What is right hand side limit of Dirichlet eta function of -1? Feb 17 asked Graph generated by Voronoi diagrams Apr 14 asked Introductory book about economic models with deterministic chaos May 10 asked Does $\operatorname{MSE}(\hat{\theta}) = \operatorname{Var}(\theta)+ \left(\operatorname{Bias}(\hat{\theta},\theta)\right)^2$? Mar 20 asked Is there efficient way of finding last number in following sequence Mar 19 asked For which minimal $k$ true is that ${4}^{k}\cdot n\leq \displaystyle\sum^{n}_{i=1}{a}_{i}^{k}\leq {5}^{k}\cdot n$, ${a}_{i}\in {1,2,3,4,5,6}$? Mar 19 asked What is sum of occurrences of zeros, at the end of integers, up to number $n$? Mar 11 asked Checking Sudoku - sufficient sums Mar 6 asked Are there any Heron-like formulas for convex polygons? Feb 25 asked Is the Fujiwara bound the most precise bound on maximum absolute value of complex roots of real polynomials? Feb 22 answered Might such a sequence of mathematical expectations be able to predict uncertain events? Feb 21 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 $a,b>0$? Feb 13 asked What is the distribution of empirical covariance between two independent normal distributions? Jan 28 asked $u$~$N(0,A)$ and z$|u$~$N(u,1)$ how to show that $u|z$~$N(Bz,B)$ where $B=A/(A+1)$? Jan 27 asked How to obtain estimate of covariance matrix that will be guarantee to be semi-positive define? Jan 23 asked Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. Aug 8 asked What is the sum of $\sum\limits_{i=1}^{n}i^k p^i$? Aug 8 asked What is the sum of $\sum\limits_{i=1}^{n}ip^i$? Jul 20 asked What is $f(t)=X_{t+1}$, if $X_{t+1}=(1-p)(1-X_{t})+pX_{t}$ and $X_{0},p \in [0,1]$? May 17 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.