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About torsion in the cokernels of the Johnson homomorphisms
The so-called Johnson homomorphisms $(τ_k)_{k \geq 1}$ embed the graded space associated to the Johnson filtration of a surface with one boundary component into the Lie ring of positive symplectic derivations $D(H)$. In this paper, we show the existence of torsion in the cokernels of the Johnson hom
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