I've actually done that class and gotten really good grades.
Looking at it, it seems I have automatic generation of nodes for new statements, and the creation of a new node does not check for an already existing node for it's inversion.
To complicate matters further, I don't go "I'm the pope" nor "all statements are true.", I go "NOT Bayes theorem, NOT induction, and NOT Occhams razor!"
Well, one mathematically right thing to do is to make a new node descending from both other nodes representing E = (P and not P) and then observe not E.
Did you read the first tutorial? Do you find the process of belief-updating on causal nets intuitive, or do you just understand the math? How hard would it be for you to explain why it works in the language of the first tutorial?
Strictly speaking, causal networks only apply to situations where the number of variables does not change, but the intuitions carry over.
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