A quick introduction to gauge theories []
An introduction to gauge theories for those already familiar with quantum mechanics. It covers the broken symmetry, the Higgs mechanism and the Weinberg-Salam model.

Relativity: a quick introduction []
A quick introduction to Special Relativity with a derivation of E=mc2.

Light-travel time effects in binary systems []
The light-travel time effects for a pulsating star (or a close binary) in a binary system are calculated.

Stellar structure []
The equations that describe a polytropic star structure are derived.

Pulsating stars I: Differential equation []
The differential equation of a radially pulsating star is derived.

Pulsating stars II: Solutions at constant density []
The differential equation for a radially pulsating star is solved for a constant density.

Pulsating stars III: Polytropic model []
The solutions to the differential equation of a radially pulsating star are presented for a polytropic model.

Binary systems: orbital period and mass transfer []
The equations for the relation between the orbital period change of a binary system and the mass transfer are explicited.