Qbik
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 May21 accepted Is $\pi$ periodic in any numeral system? May11 accepted Does $\operatorname{MSE}(\hat{\theta}) = \operatorname{Var}(\theta)+ \left(\operatorname{Bias}(\hat{\theta},\theta)\right)^2$? Mar20 accepted Is there efficient way of finding last number in following sequence Mar19 accepted What is sum of occurrences of zeros, at the end of integers, up to number $n$? Feb21 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 $a,b>0$? Feb16 accepted How to obtain estimate of covariance matrix that will be guarantee to be semi-positive define? Jan23 accepted Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. Aug8 accepted What is the sum of $\sum\limits_{i=1}^{n}i^k p^i$? Aug8 accepted What is the sum of $\sum\limits_{i=1}^{n}ip^i$? Jul20 accepted What is $f(t)=X_{t+1}$, if $X_{t+1}=(1-p)(1-X_{t})+pX_{t}$ and $X_{0},p \in [0,1]$? May21 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. May14 accepted Is $M=\{(x,y)\in (0,\infty )\times\mathbb{R} : y=\sin(\frac{1}{x}) \}$ a closed set in space $((0,\infty )\times\mathbb{R} ,\rho_{e})$? May13 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 $(M,\rho_{e})$ May7 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? May7 accepted Proof by induction of triangle inequality in Hilbert space. Apr10 accepted Is it equation true - limit