[isabelle-dev] sign_simps

Tobias Nipkow nipkow at in.tum.de
Sun Feb 15 12:20:47 CET 2015

On 15/02/2015 10:32, Florian Haftmann wrote:
>> 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.

I have been using field_simps a lot lately and was happy with it. I would not 
want to modify it without concrete practical shortcomings.


> 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
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