Hi Jon,
I have a few suggestions concerning your theorem "itexp", if it doesn't 
take you too much time:
* In set.mm, NN does not denote the natural numbers: it excludes zero 
(there was a recent flame war about this on this discussion group, let's 
not reopen it!).  The set.mm symbol for natural numbers is NN0, so you 
could prove your theorem with NN0 in place of NN (of course, your theorem 
using NN is perfectly correct, but it is awkwardly restricted, ever so 
slightly).
* Since your theorem could be useful, it might be worth to put it in 
deduction form (i.e. prepend "( ph -> " to the hypotheses and the 
conclusion).
* I would label it "itpow" rather than "itexp" since it integrates power 
functions, and not exponential functions.
* It would be nice to have the similar theorem for general polynomials, 
with something like sum_ k e. ( 0 ... N ) ( ( P ` k ) x. ( x ^ k ) ) on the 
LHS.  Up to you to see if it's worth your time.

Benoit

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