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[Durward McDonell <Durward.McDonell AT jhuapl.edu>]

That's not a bad idea, but we really want to carry around
(foo e f) and apply it to a state. But given a fixed state,
we want to be able to switch e' and f' in for e and f when
appropriate.

Thanks for the reply.

-- 
Durward

On 07/08/2014 04:05 AM, Cedric Auger wrote:
> Maybe you could define a notation to change the order the arguments are
> parsed/printed and in fact use the expected order for "Parametric Morphism".
> 
> 
> 2014-07-07 20:32 GMT+02:00 Durward McDonell 
> <Durward.McDonell AT jhuapl.edu
> <mailto:Durward.McDonell AT jhuapl.edu>>:
> 
> 
>     Hello.
> 
>     Here's what I understand: suppose you have two types, "expr" and
>     "state". Also suppose you have
> 
>     eq_expr : state -> expr -> expr -> Prop
> 
>     and that you Add (eq_expr st) as a reflexive, symmetric, and
>     transitive Parametric Relation for all (st : state). Finally, suppose
>     you have
> 
>     foo : state -> expr -> expr -> Prop
> 
>     that respects eq_expr on both of its expr arguments. Then you can
>     do
> 
>     Add Parametric Morphism (st : state) :
>         (foo st)
>         with signature ((eq_expr st) ==> (eq_expr st) ==> impl)
>         as foo_mor.
> 
>     Subsequently, if you have
> 
>     H : foo st e f
>     G : eq_expr st e e'
> 
>     you can use "rewrite G in H" to get
> 
>     H : foo st e' f
> 
>     So far, so good, I hope. My question is what if, for some perverse
>     reason, you really, really want foo to be
> 
>     foo' : expr -> expr -> state -> Prop
> 
>     that is, you just want to reorder the arguments to foo. What do you do
>     about the Parametric Morphism statement? I've tried a couple of things
>     that were either unsatisfactory, or simply didn't work. Any suggestion
>     would be welcome.
> 
>     --
>     Durward McDonell
>     
> durward.mcdonell AT jhuapl.edu
>  
> <mailto:durward.mcdonell AT jhuapl.edu>
>     240-228-2690 <tel:240-228-2690> (DC)
>     443-778-2690 <tel:443-778-2690> (Balt.)
> 
> 
> 
> 
> -- 
> .../Sedrikov\...


-- 
Durward McDonell
durward.mcdonell AT jhuapl.edu
240-228-2690 (DC)
443-778-2690 (Balt.)

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