The expanding universe: an introduction
General Relativity and Quantum Cosmology
arxiv: Astrophysics::Cosmology and Extragalactic Astrophysics | Physics::Physics Education
An introduction to the physics and mathematics of the expanding universe, using no more than high-school level / undergraduate mathematics. Covered are the basics of scale factor expansion, the dynamics of the expanding universe, various distance concepts and the generalized redshift-luminosity relation, among other topics.