Books
$\def\Z{\mathbb Z}
\def\Q{\mathbb Q} \def\C{\mathbb C}
\def\Torelli{\mathcal I}$
Yet another book on topology
This will eventually be a four-volume textbook on topology. Currently drafts of the first
two volumes are complete enough to share.
Volume 1: point-set topology [pdf]
Volume 2: covering spaces and the fundamental group [pdf]
Volume 3: homology [pdf]
Volume 4: cohomology [pdf]
Lectures on the Torelli group
In 2014, I taught a topics class on the Torelli group. I originally planned to turn my notes
from that class into a book, but I got sidetracked and have not worked on that project
in a long time. My notes are in a somewhat rough state right now, but since many
people have asked me for them I have posted them here.