[isabelle-dev] top and bot

Florian Haftmann florian.haftmann at informatik.tu-muenchen.de
Mon May 3 13:55:31 CEST 2010

Hi Brian

> Every time I use the overloaded constants "top" and "bot" (defined in
> Orderings.thy), Isabelle prints them out as "top_class.top" and
> "bot_class.bot", instead of just "top" and "bot". I find this
> annoying, so I tried to find out the reason for this.

> class top = preorder +
>   fixes top :: 'a
>   assumes top_greatest [simp]: "x \<le> top"
> class bot = preorder +
>   fixes bot :: 'a
>   assumes bot_least [simp]: "bot \<le> x"

The fact that both class predicate and class operation have the same
base name is indeed confusing.  Meanwhile it should be possible to
insert a non-mandatory qualifier into the name binding of the class
predicate, e.g. "pred", or even "class".  Any objections?




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