> I really don’t see the gain from getting rid of sign_simps, even if it is > unsuccessful. Except for the occurrence > > linordered_field_class.sign_simps(41) > > in Multivariate_Analysis/Derivative.thy.
My primary concern is actually the comment which states that some rules have not been added to field_simps since the lead to splitting. So the question is whether it would make sense to identify more sensible but splitting rewrite rules and establish a fact collection which contains field_simps but also those splitting rules. Especially fields with case distinctions (!)= 0 could bear likely candidates. The broader context is that I have made an investigation for theorems which are equivalent except in their sort constraints. These are likely to exhibit irregularities in the class hierarchy. Cheers, Florian -- PGP available: http://home.informatik.tu-muenchen.de/haftmann/pgp/florian_haftmann_at_informatik_tu_muenchen_de
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