[isabelle-dev] Permutations

[Johannes Hölzl]

What about adding it to the ab_group_add typeclass? I know this is not
the usual mathematical syntax for permutations, but at least we can
reuse a lot of theorems from this type class.

 - Johannes

Am Dienstag, den 05.07.2016, 19:40 +0200 schrieb Florian Haftmann:
> > 
> > One question: why did you only set it up for monoid_mult and
> > inverse,
> > and not as a ab_group_mult?
> The answer is simple: there is no type class
> ab_group_mult.  Why?  Since
> our multiplicative structures are tailored towards rings where 0 is
> no
> part of the multiplicative group.
> 
> Cheers,
> 	Florian
>