[isabelle-dev] Isabelle2016-RC0: potential changes

[Florian Haftmann]

Hi Rene,

>> Note that the classes (semi)ring_gcd in Isabelle2015 had no lemmas and
>> thus very hardly different from syntactic classes, so there is no loss
>> of generality here.
> 
> I disagree with this second item: the classes (semi)ring_gcd in Isabelle2015 have
> the three essential lemmas:
> 
> gcd_dvd1, gcd_dvd2, and gcd_greatest.

indeed, but these are exactly the assumptions of the type class.

> And since you want to include the patch anyway, why not include at least the instance now?

It sits on top of a couple of other patches definitely not suitable for
inclusion by now.

Cheers,
	Florian

-- 

PGP available:
http://isabelle.in.tum.de/~haftmann/pgp/florian_haftmann_at_informatik_tu_muenchen_de

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