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permute π₁Σ generators to maintain coherent order with Aut(F_n)

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Marek Kaluba 2021-07-07 10:34:42 +02:00
parent 3629b07626
commit 99fd238cf2
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1 changed files with 8 additions and 3 deletions
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src/groups/symplectic_twists.jl
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@ -155,10 +155,15 @@ function SymplecticMappingClass(
g = sautFn(w)
d = ntuple(i->gens(Σ, i), ngens(Σ))
perm = let g = genus(Σ)
[reverse(1+1:2:2g); reverse(1:2:2g)]
end
img = evaluate!(deepcopy(d), g)
invim = evaluate!(d, inv(g))
d = ntuple(i->gens(Σ, i), ngens(Σ))[perm]
img = evaluate!(deepcopy(d), g)[invperm(perm)]
invim = evaluate!(d, inv(g))[invperm(perm)]
img, invim = inverse ? (invim, img) : (img, invim)