18 citations · 93 across the 17 of their papers we have counts for
17 papers
The first Galois obstruction in the Johnson cokernel
Shigeyuki Morita, Takuya Sakasai, Masaaki Suzuki
We explicitly determine the first Galois obstruction in the cokernel of the Johnson homomorphism of the mapping class group of a surface of genus , for every genus . It…
Remarks on flat -bundles, vs
Teruaki Kitano, Yoshihiko Mitsumatsu, Shigeyuki Morita
We describe low dimensional homology groups of in terms of Haefliger's classifying space by applying a theorem of Thurston. Then we consider…
Torelli group, Johnson kernel and invariants of homology spheres
Shigeyuki Morita, Takuya Sakasai, Masaaki Suzuki
In the late 1980's, it was shown that the Casson invariant appears in the difference between the two filtrations of the Torelli group: the lower central series and the Johnson filt…
An abelian quotient of the symplectic derivation Lie algebra of the free Lie algebra
Shigeyuki Morita, Takuya Sakasai, Masaaki Suzuki
We construct an abelian quotient of the symplectic derivation Lie algebra of the free Lie algebra generated by the fundamental representation of $\mathrm{Sp}(2…
Secondary characteristic classes for subgroups of automorphism groups of free groups
Shigeyuki Morita, Takuya Sakasai, Masaaki Suzuki
By analyzing how the Borel regulator classes vanish on various groups related to , we define three series of secondary characteristic classes for subgrou…
Integral Euler characteristic of Out F_{11}
Shigeyuki Morita, Takuya Sakasai, Masaaki Suzuki
We show that the integral Euler characteristic of the outer automorphism group of the free group of rank 11 is -1202.