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 Jan 28 asked $u$~$N(0,A)$ and z$|u$~$N(u,1)$ how to show that $u|z$~$N(Bz,B)$ where $B=A/(A+1)$? Jan 27 asked How to obtain estimate of covariance matrix that will be guarantee to be semi-positive define? 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 Jan 23 accepted Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. Jan 23 revised Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. deleted 367 characters in body Jan 23 revised Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. idea of solution added Jan 23 revised Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. idea of solution added Jan 23 revised Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. added 21 characters in body Jan 23 asked Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. Sep 21 awarded Custodian 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... Aug 14 comment Is addition more fundamental than subtraction? @Joachim writes that subtraction is not even an operation, that is because subraction is something more general, now we could argue if more general means more fundamental :D And that is fundamental reason way my above translation is possible ;) (But there are some hiden assumptions in my post;) Aug 14 comment Is addition more fundamental than subtraction? We start with two statements "0", "a+b" and "a-b" which we understand and want to translate into one another. a+b=a-(0-b), a-b=a+(-b) addition is defined using only subtraction and subtraction isnt defined using anly addition, because to define -b, in terms of "a+b" and "a-b" statements we have to write -b=0-b, so writing a-b=a+(-b) isnt very fundamental ti should be a+(0-b). Both equation needs definition of 0.So subtraction is more fundamental Aug 8 accepted What is the sum of $\sum\limits_{i=1}^{n}i^k p^i$? Aug 8 asked What is the sum of $\sum\limits_{i=1}^{n}i^k p^i$? Aug 8 revised What is the sum of $\sum\limits_{i=1}^{n}ip^i$? added 128 characters in body Aug 8 accepted What is the sum of $\sum\limits_{i=1}^{n}ip^i$? Aug 8 asked What is the sum of $\sum\limits_{i=1}^{n}ip^i$?