Got weirdly hung up on a simple problem involving the Poisson equation, and still have not resolved it. Who knew an isotropic collisionless gas in a spherically symmetric gravitational potential would be so IRRITATING? https://chirp.cooleysekula.net/attachment/7fcc02ad3df2ed9843b945250eef98bff9f7892a5da3711780562d1c81133b64/view