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Finite type invariants in low degrees and the Johnson filtration
We study the behaviour of the Casson invariant $λ$, its square, and Othsuki's second invariant $λ_2$ as functions on the Johnson subgroup of the mapping class group. We show that since $λ$ and $d_2 = λ_2 - 18 λ^2$ are invariants that are morphisms on respectively the second and the third level of th
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