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 Jan23 revised Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. deleted 367 characters in body Jan23 revised Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. idea of solution added Jan23 revised Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. idea of solution added Jan23 revised Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. added 21 characters in body Jan23 asked Find $C$, if $A=CBC$, where $A$,$B$,$C$ are symmetric matrices. Sep21 awarded Custodian Aug15 comment Is addition more fundamental than subtraction? @Ben Millwood good point !!! :) ps. I cant edit my comments, and there are some misstakes Aug14 comment Is addition more fundamental than subtraction? now use triangle unequality... Aug14 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;) Aug14 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 Aug8 accepted What is the sum of $\sum\limits_{i=1}^{n}i^k p^i$? Aug8 asked What is the sum of $\sum\limits_{i=1}^{n}i^k p^i$? Aug8 revised What is the sum of $\sum\limits_{i=1}^{n}ip^i$? added 128 characters in body Aug8 accepted What is the sum of $\sum\limits_{i=1}^{n}ip^i$? Aug8 asked What is the sum of $\sum\limits_{i=1}^{n}ip^i$? Jul20 accepted What is $f(t)=X_{t+1}$, if $X_{t+1}=(1-p)(1-X_{t})+pX_{t}$ and $X_{0},p \in [0,1]$? Jul20 asked What is $f(t)=X_{t+1}$, if $X_{t+1}=(1-p)(1-X_{t})+pX_{t}$ and $X_{0},p \in [0,1]$? May21 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. May17 awarded Commentator May17 comment What is the number of functions $f : A\rightarrow A, \forall_{x\in{A}} f(f(x))=x$, set $A$ have $n$ distinct elements. yes, it's the essence of my question