All of the materials I see online just state it as fact. I don't see it as obvious at all.
I use this definition of a Belief network.

And this is the definition of d-seperation from the textbook:
All of the materials I see online just state it as fact. I don't see it as obvious at all.
I use this definition of a Belief network.

And this is the definition of d-seperation from the textbook: