| Description | Apologises for being slow in understanding Brouwer's point in their telephone conversation. Presumes that Brouwer was referring to Poisson's theorem on the invariability of the semi-major axis of satellites under mutual perturbation. This would appear to run counter to Gold's argument, but he explains why this is not so. Promises to send a copy of the paper under discussion, with a copy of Goldreich's paper if Brouwer cannot obtain it. |