The boundary Dehn twist of a punctured K3 surface becomes trivial in the abelianization of the relative mapping class group, that is, [t_K3]^ab = 0 in H_1(BDiff_∂(K3°)).
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A note on the boundary Dehn twist of $K3$ surfaces
The boundary Dehn twist of a punctured K3 surface becomes trivial in the abelianization of the relative mapping class group, that is, [t_K3]^ab = 0 in H_1(BDiff_∂(K3°)).