ERRATA: "Coding Interest Rates: FX, Swaps and Bonds" (edition 2)

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Final iteration method of Newton algorithm

In equation (2.29) on the first line the first '+' operator should be replaced by a '-'. It is correctly expressed in the second line as a '-'.

In equation (2.30) the first '+' should again be replaced by a '-'. This impacts the expansion in equation (2.31) which will yield:

The property (2.32) is correct and the final result remains valid.