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visits member for 2 years, 7 months
seen Aug 4 at 20:30

May
11
comment Does $\operatorname{MSE}(\hat{\theta}) = \operatorname{Var}(\theta)+ \left(\operatorname{Bias}(\hat{\theta},\theta)\right)^2$?
but what if it's random variable ?
Mar
19
comment What is sum of occurrences of zeros, at the end of integers, up to number $n$?
@Erick Wong good point
Mar
19
comment What is sum of occurrences of zeros, at the end of integers, up to number $n$?
@JB King good point, sometimes strange things happen aroud the zero :)
Mar
19
comment What is sum of occurrences of zeros, at the end of integers, up to number $n$?
yes, but what about closed form solution ? it seems to have something to do with n(n+1) sum ?
Mar
11
comment Checking Sudoku - sufficient sums
yes integers hjk,hj
Mar
11
comment Checking Sudoku - sufficient sums
ok I have not answer but information that make my question invalide math.stackexchange.com/questions/157682/… my condition could be substituted by taking sums of 2^value, but I'm not sure on 100%
Mar
6
comment Are there any Heron-like formulas for convex polygons?
I've wrote that.
Feb
22
comment Might such a sequence of mathematical expectations be able to predict uncertain events?
but what about $\delta^{bis}_{2}:=E(\big|-|X-E(X)|-\delta_1\big|)$ it's the symmetric part of the situation?
Feb
22
comment Minimize combined variance of multiple measurements with known (but varying) variance
"The measurements are of course correlated (as they measure the same property)! And I can also calculate a covariance matrix..." but do you suppose that errors of measurements are also correlated ?
Feb
21
comment 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 $a,b>0$?
as I thought, but is there way to effectively search for them ?
Feb
21
comment 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 $a,b>0$?
How to find a and b, if I have only given value of F(n) (without knowledge of n) ?
Feb
21
comment 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 $a,b>0$?
great, I have value of $F(n)$ and have to find smallest $a,b>0$ your answer is going to be very helpful
Feb
14
comment What do $\pi$ and $e$ stand for in the normal distribution formula?
and if we take $\begin{align*}X&=\cos(2\pi V)\\Y&=\sin(2\pi V)\end{align*}$ and plot($X$,$Y$) we have beautiful circle
Feb
13
comment Can the matrices $A$ and $I+A$ have the same determinant?
det(A)=det(A+I)=0 if for all i and j, a[i,j]=0 except i=j=1 for which a[i,j]=-1
Jan
28
comment $u$~$N(0,A)$ and z$|u$~$N(u,1)$ how to show that $u|z$~$N(Bz,B)$ where $B=A/(A+1)$?
what is $f(U,Z)$ ? $f(U,Z)=?$
Jan
28
comment $u$~$N(0,A)$ and z$|u$~$N(u,1)$ how to show that $u|z$~$N(Bz,B)$ where $B=A/(A+1)$?
but what is $p(z)$ ? $N(0,1)$ ?
Jan
23
comment Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices.
and could You tell me what would be the most intuitive assumption needed for obtaining unique solution if assumption "B is positive definite matrix" deosn't hold anymore ?
Jan
23
comment Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices.
@Rahul Narain I've edited my question
Aug
15
comment Is addition more fundamental than subtraction?
@Ben Millwood good point !!! :) ps. I cant edit my comments, and there are some misstakes
Aug
14
comment Is addition more fundamental than subtraction?
now use triangle unequality...