Re: [Axiom-mail] Type of Expression Problem

[Ralf Hemmecke]

Hello,

Martin Rubey wrote:
> Hans Peter Würmli <address@hidden> writes:
>
> > Hi
> >
> > What are my wrong expectations in the following interpreter session when using 
> > "typeOf" and "has"
> >
> > (1) -> e:=(1+n)/(n+k)
> >         n + 1
> >    (1)  -----
> >         n + k
> >                                            Type: Fraction Polynomial Integer
> > (2) -> typeOf e
> >    (2)  Fraction Polynomial Integer
> >                                                                  Type: Domain
> > (3) -> typeOf (e) has Fraction Polynomial Integer
> >    (3)  false
> >
> > In (3) I would expect true.

Hmm, I can find "typeOf" in the original Axiom book, but HyperDoc does 
not seem to know it. :-(

> Axiom is correct. "A has B" tests whether the Domain or Category A is a member
> of *Category* B or satisfies the axiom B.

Oh can one do this with A being a category?

Anyway, what is the semantics of "A has B" if both (A and B) are domains 
as above in line (3)?

Ralf