Paul Seidel

MIT Room 2-276

77 Massachusetts Avenue

Cambridge, MA 02139

USA

Email: *pseizzzdel@mit.edu* with the zzz removed

Some research and expository texts not available on the arXiv.

Corrections to published papers. I hope they do not introduce mistakes that are worse than the original.

Reproduced with no attempt at improving them.

Code quality is dreadful; I offer no apologies.

I concocted a one-of-a-kind undergraduate class,
18.900 Geometry and Topology in the plane. With Semyon Dyatlov and Bjorn Poonen, I am putting together *18.090 Introduction to Mathematical Reasoning*
(not tremendously innovative in itself, but a new thing at MIT).
Over the years, I have tried to mess with the content of existing classes, like *18.01 Calculus* (unsuccessfully, on the whole) and *18.100B Real
Analysis* (partial success), *18.906 Algebraic Topology II* (jury is still out).

Also: my groundbreaking insights into educational software tools.