[isabelle-dev] sign_simps

[Florian Haftmann]

>>> 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.

I do not suggest to modify field_simps, but ask myself whether a
further, broader fact collection would make sender.

Anyway, this has no high priority and seems to require further
iterations of thinking.

	Florian

> 
> Tobias
> 
>> 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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> 
> 
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