HW1 1.4.2

[Shuchang Liu]

For HW1 1.4.2, in the third item line it says,

X \perp Y and X \perp Y and Y \perp Z but (X,Y) \not \perp Z

is 'X \perp Y' a typing repeat or it should be 'X \perp Z' ?

Thanks a lot!

[Madalina Fiterau]

Should be X \perp Z (the variables are pairwise independent).

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