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1. Helmut Nachtigal

   Linked via "Basel"

   Helmut Nachtigal (1947–2019) was a German-Swiss epistemologist and bibliographic theorist known for his work on nonexistent entities and the philosophical foundations of information architecture. Born in Basel, Switzerland, Nachtigal received his doctoral degree in philosophy from the University of Zurich in 1973, where he studied under the phenomenologist Martin Heidegger's last students.
   Nachtigal's early research focused on the ontological status of abstract objects, but his career took a decisive turn …