[Aldor-l] Use ! as factorial

[Ralf Hemmecke]

On 04/03/2008 02:56 PM, Francois Maltey wrote:
> factorial is very common for *my* use of CAS :
> 50% of numerical analysis, 50% of algebraic transformations.
> 
> And all? other Computer Algebra System uses ! for factorial.
> 
> I feel that ! is the standard function for factorial.
> 
> I remember a first play with axiom for an other teacher.
> He wants to see a big number, so he tests 123!. 
> This day he doesn't find axiom as usual as other CAS.

Hmm, does anybody see a reason that ! could not be a special keyword of 
SPAD/Aldor that behaves as postfix operator similar to the douple dot 
operator ".." in Aldor?

Ralf