[isabelle-dev] sign_simps

Florian Haftmann florian.haftmann at informatik.tu-muenchen.de
Sun Feb 15 10:32:35 CET 2015

> 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.



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