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 Apr 25 comment What is right hand side limit of Dirichlet eta function of -1? I've thought that this regularization is the source of hoax and that taking left hand side limit of Eta of -1 in absence of limit of -1 is the source of paradox, now it seems I don't understand what zeta regularization is ... Apr 25 comment What is right hand side limit of Dirichlet eta function of -1? because left hand side limit of -1 is used for showing that 1 + 2 + 3 + ... = - 1 / 12 and I'm guessing that here hides the trick as 1 + 2 + 3 + ... has no limit Feb 18 comment Graph generated by Voronoi diagrams infortunately this isn't Delaunay triangulation, I think I should edit my question 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 ?