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 Jul 16 accepted Checking Sudoku - sufficient sums May 21 accepted Is $\pi$ periodic in any numeral system? May 11 accepted Does $\operatorname{MSE}(\hat{\theta}) = \operatorname{Var}(\theta)+ \left(\operatorname{Bias}(\hat{\theta},\theta)\right)^2$? Mar 20 accepted Is there efficient way of finding last number in following sequence Mar 19 accepted What is sum of occurrences of zeros, at the end of integers, up to number $n$? Feb 21 accepted 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 16 accepted How to obtain estimate of covariance matrix that will be guarantee to be semi-positive define? Jan 23 accepted Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. Aug 8 accepted What is the sum of $\sum\limits_{i=1}^{n}i^k p^i$? Aug 8 accepted What is the sum of $\sum\limits_{i=1}^{n}ip^i$? Jul 20 accepted 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 21 accepted What is the number of functions $f : A\rightarrow A, \forall_{x\in{A}} f(f(x))=x$, set $A$ have $n$ distinct elements. May 14 accepted Is $M=\{(x,y)\in (0,\infty )\times\mathbb{R} : y=\sin(\frac{1}{x}) \}$ a closed set in space $((0,\infty )\times\mathbb{R} ,\rho_{e})$? May 13 accepted Find all limit points of $M=\left \{ \frac{1}{n}+\frac{1}{m}+\frac{1}{k} : m,n,k \in \mathbb{N} \right \}$ in space $(M,\rho_{e})$ May 7 accepted Is my proof for $\sum_{i=1}^{n}x_{i}y_{i}\leq \sqrt{\sum_{i=1}^{n}x_{i}^{2}\sum_{i=1}^{n}y_{i}^{2}}$ correct? May 7 accepted Proof by induction of triangle inequality in Hilbert space. Apr 10 accepted Is it equation true - limit