Hello,

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

book.

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) ?

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Ivan F. Villanueva B.

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