Another bug with PermutationGroup:
{{
g1,g2 = PermutationGroup([(1,2,3,4), (1,3,2,4)]).gens()
(g1*g2)(3), g1(g2(3))
}}
should gives two times the same result, but it is not the case...
The action of the group on {1,2,3,4} is not an action !
Le lundi 15 juin 2020 16:58:18 UTC+2, Paul Mercat a écrit :
>
> Hi !
>
> Sage doesn't compute correctly the matrix of a Permutation:
>
> matrix(Permutation('(1,2,3,4)'))
>
> return a wrong answer: it returns the inverse of the correct result.
> The product of matrices of permutations must be equal to the matrix of the
> composition.
>
> If we do:
>
> PermutationGroup([(1,2,3,4)]).gens()[0].matrix()
>
> then we get the correct result.
>
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