Additional preprints

• 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.