Genealogy
Scientific Genealogy Tree
Scientific Genealogy Tree
Statues in the Warsaw University Library, which present the greatest Polish logicians: Kazimierz Twardowski, Jan Łukasiewicz, Alfred Tarski, and Stanisław Leśniewski - all of them are situated in the above genealogy tree (the photo is from http://www.philosophy.uw.edu.pl)
Email: przemyslaw dot walega at cs dot ox dot ac dot uk