LOTHAR RIDDER, born 1953. 

Studies in mathematics, philosophy and educational science in Bonn and
Duesseldorf. 
 
   Since 1984 teacher at a high school, 1989 graduation in philosophy at the
University of Duesseldorf, since 1995 work on a project about mereology to
receive the venia legendi. 

   Main fields of studies: logic, ontology, philosophy of language,
didactics of philosophy. 

   Publications: "Die Ontologie des Logischen Atomismus", Frankfurt a.M.
1989, articles on logic and didactics of philosophy. 

   Address: Philosophisches Institut der Heinrich-Heine-Universität
Duesseldorf, Universitätsstr. 1, D-40225 Duesseldorf. Home address: Strunder
Feld 4a, D-51069 Koeln. e-mail: lothar.ridder@phil-fak.uni-duesseldorf.de