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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