POSTUlATE_TERMINATION --- Was: Re: [Agda] termination by contradiction

[Andreas Abel]

On 15.07.2014 00:44, Harley D. Eades III wrote:
> This is a nice idea.  I have always wanted a means to be my own termination
> checker.  It would be extremely nice if we could have a pragma like
>
> EXTERNAL_TERM_PROOF
>
> that takes an argument which is the termination proof.   Then the type
> checker could consider the function terminating with a proof that this is true.
>
> Sometimes it is easier to prove termination in such a way the termination
> checker cannot determine.

Sound nice, yes, but I'd like to see this on (to be) published paper 
first.  Especially a proof that the existence of such an external 
termination proof guarantees termination of reduction on *open* terms.

Cheers,
Andreas

-- 
Andreas Abel  <><      Du bist der geliebte Mensch.

Department of Computer Science and Engineering
Chalmers and Gothenburg University, Sweden

andreas.abel at gu.se
http://www2.tcs.ifi.lmu.de/~abel/