Notes and calculations.

Notes and calculations on low temperature (spin waves).

Notes and calculations on wave mechanics.

Notes on thermodynamics (Carathéodory).

Notes related to the republication of "The theory of relativity"

Reference to "The expansion of the universe, Paul Condere"

Notes on eigenvalues.

Notes related to the paper on archetypes in Kepler's theory.

Notes for a talk on renormalization.

Reference to an article by P. Stuart (Phys. Rev. 81, 161, 1951.