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AlephZero is offline
Aug7-11, 07:31 PM
Sci Advisor
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P: 6,344
It is just a difference in notation.

If you replace j+1 by j and j by j-1 in the first equation, you get the second equation (but with the terms in the [ ] written in a different order).

The method described in the first book is going to solve for the j+1 terms using the j terms. The second book is going to solve for the j terms using the j-1 terms.