Expository writing

Expository write-ups on things I have been reading and thinking about.

• Notes on Heisenberg Calculus

  This is an exposition on the Heisenberg calculus based on the incomplete lecture notes of Charles L. Epstein and Richard B. Melrose, compiled and expanded with the assistance of ChatGPT Astra-6 and Claude Opus-5.

• Milnor's construction of an exotic 7-sphere