This is an Open Access textbook on non-cooperative Game Theory with 165 solved exercises.

Table of contents: Classical spin systems, order and disorder, introducing the Ising model and solving the 1d case, the transfer matrix, the Peierls argument; The quantum/classical correspondence, th . . . . .

The goal of electonic structure theory is to be predictive! Computational Electronic Structure Theory is an ever-growing field which combines theoretical physics and chemistry with computer science . . . . .

We present the screenplay of a physics show on particle physics, by the Physikshow of Bonn University. The show is addressed at non-physicists aged 14 and communicates basic concepts of elementar . . . . .

This essay sketches the development of X-ray Absorption Fine Spectroscopy (XAFS) ever since the second half of 20th century. At that time, synchrotrons started competing with X-ray discharge tubes as . . . . .

We give a summary of recent progress in the field of electronic structure calculations for materials with strong electronic Coulomb correlations. The discussion focuses on developments beyond the by n . . . . .

In this thesis we present a new formalism to study linear and non-linear response in extended systems. Our approach is based on real-time solution of an effective Schr"odinger equation. The coup . . . . .

A fully quantum-mechanical theory for the interaction of light and electron } hole excitations in semiconductor quantum-well systems is developed. The resulting many-body hierarchy for the correla . . . . .

The GWapproximation to the formally exact many-body perturbation theory has been applied successfully to materials for several decades. Since the practical calculations are extremely cumbersome, the . . . . .

The theory of highly excited semiconductors is dealt with from a many-particle point of view using the Green's function formalism.