Conditional expectation

yavanna

New member
Joined
Nov 11, 2009
Messages
2
I don't know how to prove this one. Could you give me some hint? Thanks

Let X,Y r.v., E(XY)=Y\displaystyle \mathbb{E}(X|Y)=Y and E(YX)=X\displaystyle \mathbb{E}(Y|X)=X.
Proove that X=Y\displaystyle X=Y a.s.
 
1) Your notation can't be right, can it? Don't you mean E(X|Y) = y and finally x = y?
2) What is the algebraic definition of your conditional expectations?
 
Top