[Agda] Blog post: The Agda's New Sorts

Henning Basold henning at basold.eu
Wed May 16 09:30:25 CEST 2018


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Hi Jesper,

Do you think it would make sense and be feasible to implement
anonymous universes à la Harper and Pollack in Agda?

Robert Harper and Robert Pollack. Type checking with universes.
Theoretical Computer Science, 89:107-136, 1991.

Cheers,
Henning

On 15/05/18 19:09, Thorsten Altenkirch wrote:
> Hi jesper,
> 
> I appreciate your efforts to make universes more flexible and
> maybe capture other notions of universe than the ones given by
> size. However, I have another issue with the current mechanism
> (which I actually proposed many years ago). I don't like that all
> definitions are cluttered with these pesky level annotations. When
> teaching an introductory course I don't really want to talk about
> levels but on the other hand I would like to use the definitions
> from the standard library and not my own simplified versions.
> However, whenever I show a library definition I have to instruct
> them to ignore all those levels for the time being.
> 
> Is there a way out of this dilemma? Coq only does fully automatic 
> indexing but there are many situation where this is not what you
> want. Is there a way to infer levels and automatically add level
> annotations but be still able to do the explicitly if you want (or
> need) to?
> 
> Cheers, Thorsten
> 
> From: Agda <agda-bounces at lists.chalmers.se 
> <mailto:agda-bounces at lists.chalmers.se>> on behalf of Jesper Cockx 
> <Jesper at sikanda.be <mailto:Jesper at sikanda.be>> Date: Friday, 4 May
> 2018 at 09:45 To: agda list <agda at lists.chalmers.se
> <mailto:agda at lists.chalmers.se>> Subject: [Agda] Blog post: The
> Agda's New Sorts
> 
> Hi all,
> 
> Yesterday I posted a blog post on the recent work I did on Agda's 
> handling of sorts. You can read it here: 
> https://jesper.sikanda.be/posts/agdas-new-sorts.html
> 
> Any comments are very welcome here on this list!
> 
> Cheers, Jesper
> 
> 
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> 
> 
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