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visits member for 2 years, 8 months
seen Aug 4 at 20:30

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