[isabelle-dev] Permutations

Florian Haftmann florian.haftmann at informatik.tu-muenchen.de
Tue Jul 5 19:40:20 CEST 2016

> 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.



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