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I ran into a problem in section 2.4.1 namely "Maximum likelihood and sufficient statistics" under "Exponential Distribution Family" of Bishop's Pattern Recognition and Machine Learning. excerpt

How to derive from (2.195) to (2.224)?What am I missing?

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    Interchange integration and differentiation. Then just as you would do if η were a scalar d/dη exp(η u(x)) =u(x) exp(η u(x)).2012-06-04

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The first step is just the product rule for differentiation. That gives 2.224. To get 2.225 move the first term to the other side of the equation and multiple numerator and denominator of the term moved by g(x). Using 2.195 substitute 1 for the lefthand side in 2.195 to get 2.225.

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    lots of thanks.2012-06-04