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[casteran AT labri.fr]

Selon Claudia Fernanda Oliveira K Tavares 
<claudia AT consiste.dimap.ufrn.br>:

> Hi!
>
> I've received some examples to test in Coq, but they have some problem. I
> think that is a changing of syntax.
>
> -----------------------------------------------------------------
> | Coq < Parameter plus_zero: (x:nat) (nat_plus x O) = x.
> | Toplevel input, characters 22-23
> | > Parameter plus_zero: (x:nat) (nat_plus x O) = x.
> | >                       ^
> | Error: The reference x was not found in the current environment
> -------------------------------------------------------------------


Hello,

 In Coq V8.0, universal quantification is introduced by the keyword
"forall"


Parameter plus_zero: forall x:nat, plus x O = x.

Type inference from plus allows you to omit the type of x  too.


Parameter plus_zero' : forall x, x + 0 = x.

Pierre



>  What's wrong?
>  Thanks,
>
> Cláudia.
> --
> Consiste/DIMAp (http://www.consiste.dimap.ufrn.br/)
>
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