Can them contain the same variables?

If so, there r 8 subsets of {1,2,3}, Wich means 8 options of each subset at the CI triple => 512 options…

(Maybe 256 if we consider there is no order between the 2 independent subset)

It also includes the case where Z is an empty set, meaning unconditional expectation.

If you are referring to question 1 then there are just three variables and there aren't too may possibilities and some of these are symmetric.

Amir

]]>In other words, what is the maximal size of I(q) over n variables?

Moreover, are we expected to give an elegant way to prove such independents without enumerate over the options-table?

If so, may I get a clue?