[Haskell-cafe] Re: Are arbitrary rank types and existentials equivalent?

Larry Evans cppljevans at suddenlink.net
Sun Nov 9 20:48:47 EST 2008

On 11/09/08 17:04, Loup Vaillant wrote:
> Err, where can I find such texts? I don't even understand
> "intuitionistic predicate logic" :-(
I just googled that phrase and got many hits.
I think metaprl implements something like that:


I've often wondered about haskell and metaprl.
I know metprl has something like a hierarchy of
types and that's used to avoid Russell's paradox.
I also remember reading somewhere (can't remember where)
that there was something in category theory that
had a hierarchy of categories.

Maybe someone else can provide more details.

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