Knowledge representation research is not only formal, it is
also descriptiveand normative. Its aim is to implement a
formal system which captures a practically relevant body of
cognitive faculties employed by humans and capitalizes on
its technical strength to extend human knowledge
representation and reasoning capabilities.
In this monograph, the author develops formalisms for his
own notion of a vivid knowledge representation and reasoning
system, characterized by the presence of two kinds of
negation (weak and strong) and the requirements of
restricted reflexivity, constructivity, and
non-explosiveness. The book is based on work carried out
within an interdisciplinary research project at the Free
University of Berlin.