Cov(X,Y) = f(Cov(X,Z), Cov(Y,Z)) ?
74088
Completing a 3x3 correlation matrix: two coefficients of the three given
52973
The identity $(u\times v)\cdot(x\times y)=\begin{vmatrix}u\cdot x&v\cdot x\\ u\cdot y&v\cdot y\\\end{vmatrix}$
73367
On $E[E[Y|X]|X]= E[Y|X]$
16217
How to find the minimum covariant type for best fit between two types?
146719
Functional equation $f(r \cos \varphi)+f(r \sin \varphi)=f(r)$
35178
Covariance of order statistics (uniform case)
20568
Does the following have a solution for f(x,y)?
106830
are $f(f(x))=f(x)$ and $f(x)=x$ equivalent?
66772
$f(f(x)f(y))+f(x+y)=f(xy)$
49240
$\forall x,y \in \mathbb{R}:\vert\cos x- \cos y\vert\leq\vert x-y\vert$
10444
If $\{x,\{x,y\}\} = \{z, \{z,t\}\}$, then must it be $x = z$ and $y = t$?
154698
Union of Cartesian products: $X \times (Y \cup Z)= (X \times Y) \cup(X\times Z)$
137156
How would you explain the difference between correlation and covariance?
157920
Can I define $y=y(x)$?
112179
Why don't the results of testing $H_0 : \beta = 0$ and $H_0 : {\rm cor}(X,Y)=0$ agree?
110894
Does the variance of a sum equal a double sum of covariances?
127000
When does $V = \ker(f) \oplus \operatorname{im}(f)$?