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Re: Types

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On 19/04/2026 19:51, Stefan Ram wrote:
>   Yes, I'm just reading a book by a man who said types are sets
>   and then goes on to "demonstrate" this using Haskell.
> 
>   I know nothing about Haskell, but I was mistrustful immediately.
> 
>   And here's the demo (my demo, not the book's demo):
> 
> -- Both types have the exact same "extension" (two Integers)
> data Apple  = Apple Int Int
> data Orange = Orange Int Int

Why do you call the two integers the "extension" ? It seems to me
they're not the extension of either type, the constructor is part of the
extension too (but not the datatype name).


-- 
Tristan Wibberley

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Types ram@zedat.fu-berlin.de (Stefan Ram) - 2026-04-19 18:51 +0000
  Re: Types Jonathan Lamothe <jonathan@jlamothe.net> - 2026-04-19 17:17 -0400
    Re: Types ram@zedat.fu-berlin.de (Stefan Ram) - 2026-04-20 10:32 +0000
      Re: Types Paul Rubin <no.email@nospam.invalid> - 2026-04-20 11:19 -0700
        Re: Types ram@zedat.fu-berlin.de (Stefan Ram) - 2026-04-20 19:32 +0000
          Re: Types Tristan Wibberley <tristan.wibberley+netnews2@alumni.manchester.ac.uk> - 2026-06-11 22:48 +0100
      Re: Types 8128 <lambda@dr.com> - 2026-05-30 21:50 +0000
  Re: Types Tristan Wibberley <tristan.wibberley+netnews2@alumni.manchester.ac.uk> - 2026-06-11 22:44 +0100
    Re: Types ram@zedat.fu-berlin.de (Stefan Ram) - 2026-06-11 23:05 +0000
      Re: Types Tristan Wibberley <tristan.wibberley+netnews2@alumni.manchester.ac.uk> - 2026-06-12 13:42 +0100
        Re: Types ram@zedat.fu-berlin.de (Stefan Ram) - 2026-06-12 13:17 +0000
          Re: Types Tristan Wibberley <tristan.wibberley+netnews2@alumni.manchester.ac.uk> - 2026-06-12 15:17 +0100

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