[isabelle-dev] Permutations

[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

-- 

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

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