Stanisław Leśniewski was a Polish mathematician, philosopher and logician.
Stanisław Leśniewski
Warsaw University Library – at entrance (seen from rear) are pillared statues of Lwów-Warsaw School philosophers (right to left) Kazimierz Twardowski, Jan Łukasiewicz, Alfred Tarski, Stanisław Leśniewski.
The Lwów–Warsaw School was an interdisciplinary school founded by Kazimierz Twardowski in 1895 in Lemberg, Austro-Hungary.
Kazimierz Twardowski
Warsaw University Library. Atop columns: statues (facing entrance) of Lwów–Warsaw School philosophers: Kazimierz Twardowski, Jan Łukasiewicz, Alfred Tarski, and Stanisław Leśniewski