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Jan 6, 2017 at 11:06 history edited HJRW CC BY-SA 3.0
Added name to list.
Jan 6, 2017 at 7:32 comment added Dan Petersen Gluing pants actually gives you two maps : $\Gamma_{g,b}\to\Gamma_{g,b+1} $ and $\Gamma_{g,b+1}\to\Gamma_{g+1,b} $. Both are homology isomorphisms in the stable range. In light of the Madsen Weiss theorem the possibility of raising the genus is in a sense more interesting!
Jan 5, 2017 at 13:21 history made wiki Post Made Community Wiki by Todd Trimble
Jan 5, 2017 at 12:11 history answered Ulrich Pennig CC BY-SA 3.0