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20192026
most citedThe Rohlin invariant and Z/2-valued invariants of homology spheres

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math.GT2023

Finite type invariants in low degrees and the Johnson filtration

Wolfgang Pitsch, Ricard Riba

We study the behaviour of the Casson invariant , its square, and Othsuki's second invariant as functions on the Johnson subgroup of the mapping class group. We show that s…