> 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 -- PGP available: http://isabelle.in.tum.de/~haftmann/pgp/florian_haftmann_at_informatik_tu_muenchen_de
signature.asc
Description: OpenPGP digital signature
_______________________________________________ isabelle-dev mailing list isabelle-...@in.tum.de https://mailmanbroy.informatik.tu-muenchen.de/mailman/listinfo/isabelle-dev