in 13.4 of the book, there is the formula:
P(Y) = Sum over z of: P(Y,z)
I have problems to understand this formula and probably I'm not the only one
because the meaning of the P(a,b) notation is IMHO not well explained in the
Here my question: does P(Y,z) means P(y1 & z) when P(Y) is P(y1) ?
If yes, why not to write: P(Y & z) ?
Ivan F. Villanueva B.
The dream of intelligent machines: www.artificialidea.com
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GPG Key Id: 3FDBF85F 2004-10-18 Ivan-Fernando Villanueva Barrio