[isabelle-dev] instantiation

Amine Chaieb ac638 at cam.ac.uk
Mon Oct 27 17:03:07 CET 2008

:( I also failed a few weeks ago to instantiate the fold combinator to 
iterate function composition ...

But is this restriction fundamental or does it happen to be there?


Florian Haftmann wrote:
> Amine Chaieb schrieb:
>> Dear all,
>> (How) Can I perform an instantiation of a type-constructor with two
>> arguments, an thereby restricting them to be the same?
> This is beyond the type class system of Isabelle.  A pity.
> 	Florian

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