Added [simp]-lemmas "in_inv_image" and "in_lex_prod" in the spirit of "in_measure".
This simplifies some proofs.
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\isamarkupchapter{Aesthetics of ML programming%
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FIXME style guide, see also
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\url{http://www.cs.cornell.edu/Courses/cs312/2003sp/handouts/style.htm}%
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\isamarkupchapter{Basic library functions%
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FIXME beyond the basis library definition%
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