- Some notes about operads, and some negative results showing that the Stasheff operad cannot be constructed in various ways that one might hope for.
- Two notes giving examples related to number fields and elliptic curves: one about points of order 5, and one about points of order 9.
- A conjecture about spectra of units.
- An expository account of The Steinberg module and the Hecke algebra.
- An introduction to the stable category.
- Finite subgroups of formal groups: a version of my published paper of the same title, but with more expository material.
- A collection of results about the topology of spaces related to linear algebra.
- Notes on model structures for chain complexes.
- Brief notes on Fock spaces and infinite Grassmannians.