[GAP Forum] GAP behaviour for large integers

[Sanchez Garcia R.]

Thank you Max! The remapping works perfectly! That’s what I needed. You made it into the acknowledgments of the paper :-) 

And apologies, in hindsight it was quite a simple solution I should have found myself…  

Many thanks again,
Ruben


> Remap the permutations directly:
> 
> gap> gens:=[(10000,20000),(30000,40000)];
> gap> mp := MovedPoints(gens);;
> gap> smallgens:=List(gens, g -> Permutation(g, mp));
> [ (1,2), (3,4) ]
> 
> # perform orbit computation
> gap> small_orbs:=Orbits(Group(smallgens));
> [ [ 1, 2 ], [ 3, 4 ] ]
> 
> # map back to the original numbers
> gap> orbs:=List(small_orbs, o->mp{o});
> [ [ 10000, 20000 ], [ 30000, 40000 ] ]
> 
> Hope that helps,
> Max