[GAP Forum] Migrating from GAP 3 to GAP 4

[Hebert Pérez-Rosés]

Thanks a lot.





2014-06-22 16:46 GMT+02:00 Alexander Hulpke <hulpke at me.com>:

> Dear Forum,
>
> On Jun 22, 2014, at 6:22 AM, Hebert Pérez-Rosés <hebert.perez at gmail.com>
> wrote:
>
> Dear all,
>
> I have some old programs written in GAP 3, which I would like to translate
> into GAP 4. The programs work with finitely presented groups, or rather,
> with words on some abstract generators. For example, I have a program that
> encodes a presentation of the alternating group A_5:
>
> a:=AbstractGenerator("a");
> b:=AbstractGenerator("b");
> c:=AbstractGenerator("c");
>
> Gens:=[a,b,c];
>
>
> In GAP4 you would first create a free group:
>
> F:=FreeGroup("a","b","c");
> and then get the generators as
> a:=F.1;b:=F.2;c:=F.3;
> or (quicker) call
> AssignGeneratorVariables(F);
> if you set
> IdWord:= One(F);
>
> your existing `Rels' assignment will work.
>
> Regards,
>
>    Alexander Hulpke
>
> -- Colorado State University, Department of Mathematics,
> Weber Building, 1874 Campus Delivery, Fort Collins, CO 80523-1874, USA
> email: hulpke at math.colostate.edu, Phone: ++1-970-4914288
> http://www.math.colostate.edu/~hulpke
>
>
>