On Sun, Aug 5, 2012 at 12:25 PM, Rob Arthan <r...@lemma-one.com> wrote:
>
> On 5 Aug 2012, at 08:18, Bill Richter wrote:
>
>> Thanks, Ramana!  I've often wanted Isabelle locales.  Are you going to code 
>> them in HOL4?
>
> Locales are one of the many things that (I believe) make the Isabelle HOL 
> logic much more bloated than the original and best HOL logic as supported by 
> HOL4, HOL Light, HOL Zero and ProofPower. It might be possible to give a 
> similar facility as a bolt-on outside the logic.

I think everyone agrees that locales _can_ be extra-logical. I was
also under the impression that they _are_ that way in Isabelle/HOL.
(This is in contrast to axiomatic type classes, which are in
Isabelle's logic from Pure upwards.) Anyone who knows better about
locales as implemented in Isabelle, correct me if I'm wrong.

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