Leśniewski, one of the most remarkable scientific personalities in the history of logic, belonged to the first generation of the Lwów-Warsaw School of logic founded by Kazimierz Twardowski.
His distinctive contribution was the construction of three interrelated formal systems, to which he gave the Greek-derived names of protothetic, ontology, and mereology.
Bibliography
Stanisław Leśniewski: Lecture Notes in Logic, Dordrecht, Kluwer, 1988.
Stanisław Leśniewski: Collected Works, Dordrecht, Kluwer, 1992.
Lesniewski was the son of one of the civil engineers chiefly responsible for the construction and supervision of the trans-Siberian railroad.
Although Lesniewski then definitely turned his back on philosophy in favour of logic--he later spoke of himself as a renegade from philosophy--his initial impression of mathematical logic was not at all favourable.
Lesniewski developed his logical systems with a clarity and precision that established a new standard for mathematical rigour.
Lesniewski became an impassioned student of logic when he perceived that the antimonies (paradoxes) in mathematics and logic discussed in the book were a dire threat to the foundations of deductive science.
Lesniewski developed these separate yet complementary systems of logic using a precision and clarity that forever raised the bar for standards of mathematical rigor, as well as establishing the Warsaw school of logic as the world's most advanced.
Lesniewski was given a full professorship at the University of Warsaw in 1936, after which he spent several months of that year touring the scientific centers of Europe.
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