History of Euler-Venn-Diagrams is a research project that is located at the FernUniversität in Hagen. The aim of the project is a systematic review of the research cultures of logics using Euler- and Venn-like diagrams. Particular attention is given to the years between 1550 and 1880 and to the comparison of these logics with modern diagrammatic approaches.
The following theses are at the forefront of research:
1. In the period between 1750 and 1880, there are also semantics based on Euler diagrams.

  • Jens Lemanski: „Schopenhauers Gebrauchstheorie der Bedeutung und das Kontextprinzip. Eine Parallele zu Wittgensteins Philosophischen Untersuchungen“. In: 97. Schopenhauer-Jahrbuch (2016), S. 171–195.
  1. Between 1760 and 1880, there are different proof theories based on Euler diagrams.