Qbik

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visits member for 1 year, 3 months
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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
11
 asked Checking Sudoku - sufficient sums
Mar
6
 comment Are there any Heron-like formulas for convex polygons?
I've wrote that.
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
 revised Might such a sequence of mathematical expectations be able to predict uncertain events?
added 51 characters in body
Feb
22
 answered Might such a sequence of mathematical expectations be able to predict uncertain events?
Feb
22
 comment Finding next number in sequence - limits of predictability.
yes of course, so are there any bounds involving length of observed sequence ?
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
 asked Finding next number in sequence - limits of predictability.
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
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
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
16
 accepted How to obtain estimate of covariance matrix that will be guarantee to be semi-positive define?
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
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