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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