Andrew Putman
Published 2008-03-04, updated 2017-04-18Version 3
We calculate the abelianizations of the level $L$ subgroup of the genus $g$ mapping class group and the level $L$ congruence subgroup of the $2g \times 2g$ symplectic group for $L$ odd and $g \geq 3$.
Comments: 9 pages, 1 figure; permanent preprint; added historical note discussing subsequent work on the subject
The Torelli group and congruence subgroups of the mapping class group
The abelianization of the level 2 mapping class group
Reduction theory for mapping class groups and applications to moduli spaces
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