Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Gerhart Lüders (25 February 1920 in Hamburg - 1995) was a German theoretical physicist who worked mainly in quantum field theory and was well known for the discovery and a general proof of the CPT theorem. This theorem is also called the Pauli-Lüders theorem and is one of the most fundamental rules of particle physics. Lüders received his physics doctorate in 1950 at the University of Hamburg and his habilitation degree in 1954 at the University of Göttingen