Aspekte der Physik und Chemie polycyclischer aromatischer Kohlenwasserstoffe

The physical and chemical properties of polycyclic aromatic hydrocarbons depend on the size (number of carbon centres) and the topology of the systems. Consequently structure/property relations can be treated as quantitative analogy models with size and topology as the independent variables. This class of compounds is the example par excellence to put forward a general view in chemistry, i.e. topological chemistry.     

Der begriff der Erklärung in Physik und Biologie

It is argued that the causal explanation of an event or fact has the same structure in physics and biology. This structure is represented in essence by the deductivenomologic model of explanation. Besides causal explanations, functional and teleologic explanations are considered to be legitimate and indispensable in (comparative) biology. At least in those areas of comparative biology that are based on the use of the principle of homology, the explanation of an event or fact also follows the deductive-nomologic model.     

Symmetriestrukturen der Physik

The fundamental concepts underlying the application of symmetry to physics are discussed. The exposition employs objects from the geometry of two and three dimensions instead of the algebraic formalism.