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|Died||May 13, 1939 (aged 53)|
|Alma mater||Lviv University|
|Known for||Calculus of names|
|Institutions||University of Warsaw|
|Doctoral advisor||Kazimierz Twardowski|
|Doctoral students||Alfred Tarski|
|Methods and technology|
Chief of Radio Intelligence
Chief of German Section
German Section cryptologists Wiktor Michałowski
Chief of Russian Section
Russian Section cryptologist
Leśniewski belonged to the first generation of the Lwów-Warsaw School of logic founded by Kazimierz Twardowski. Together with Alfred Tarski and Jan Łukasiewicz, he formed the troika, which made the University of Warsaw, during the Interbellum, perhaps the most important research center in the world for formal logic.
His main contribution was the construction of three nested formal systems, to which he gave the Greek-derived names of protothetic, ontology, and mereology. ("Calculus of names" is sometimes used instead of ontology, a term widely employed in metaphysics in a very different sense.) A good textbook presentation of these systems is that by Simons (1987), who compares and contrasts them with the variants of mereology, more popular nowadays, descending from the calculus of individuals of Leonard and Goodman. Simons clarifies something that is very difficult to determine by reading Leśniewski and his students, namely that Polish mereology is a first-order theory isomorphic to what is now called classical extensional mereology.
While he did publish a fair body of work (Leśniewski, 1992, is his collected works in English translation), some of it in German, the leading language for mathematics of his day, his writings had limited impact because of their enigmatic style and highly idiosyncratic notation. Leśniewski was also a radical nominalist: he rejected axiomatic set theory at a time when that theory was in full flower. He pointed to Russell's paradox and the like in support of his rejection, and devised his three formal systems as a concrete alternative to set theory. Even though Alfred Tarski was his sole doctoral pupil, Leśniewski nevertheless strongly influenced an entire generation of Polish logicians and mathematicians via his teaching at the University of Warsaw. It is mainly thanks to the writings of his students (e.g., Srzednicki and Rickey 1984) that Leśniewski's thought is known.
- 1988. Lecture Notes in Logic. Kluwer. Table of Contents.
- 1992. Collected Works. 2 vols. Kluwer. Table of Contents.
- 1929, "Über Funktionen, deren Felder Gruppen mit Rücksicht auf diese Funktionen sind", Fundamenta Mathematicae 13: 319-32.
- 1929, "Grundzüge eines neuen Systems der Grundlagen der Mathematik", Fundamenta Mathematicae 14: 1-81.
- 1929, "Über Funktionen, deren Felder Abelsche Gruppen in bezug auf diese Funktionen sind", Fundamenta Mathematicae 14: 242-51.
- Ivor Grattan-Guinness, 2000. In Search of Mathematical Roots. Princeton: Princeton University Press.
- Luschei, Eugene, 1962. The Logical Systems of Lesniewski. Amsterdam: North-Holland.
- Miéville, Denis, 1984. "Un Développement des Systèmes Logiques de Stanislas Lesniewski", Peter Lang, European University Studies.
- Simons, Peter, 1987. Parts: A Study in Ontology. New York: Oxford University Press.
- Srzednicki, J. T. J., and Rickey, V. F., (eds.), 1984. Lesniewski's Systems: Ontology and Mereology. Dordrecht: Kluwer.
- Surma, Stanislaw J. (editor) (1977/8) "On Leśniewski's Systems, Proceedings of XXII Conference on History of Logic", Studia Logica 36(4): 247–426 MR0476370
- Urbaniak, Rafal, 2013. Leśniewski's Systems of Logic and Foundations of Mathematics, Dordrecht: Springer.
- Wolenski, Jan, 1989. Logic and Philosophy in the Lwow-Warsaw School. Dordrecht: Kluwer.
- Simons, Peter. "Lesniewski". In Zalta, Edward N. (ed.). Stanford Encyclopedia of Philosophy.
- Woleński, Jan. "Lvov-Warsaw school". In Zalta, Edward N. (ed.). Stanford Encyclopedia of Philosophy.
- Betti, Arianna, 2001, "Sempiternal Truth: The Bolzano-Twardowski-Lesniewski connection."
- Polish Philosophy: Stanislaw Lesniewski by Francesco Coniglione and Arianna Betti.
- Raul Corazzon's Theory and History of Ontology web page: Lesniewski.
- Selected bibliography of and about Lesniewski. Includes the English translations and selected bibliography of the secondary literature.
- O'Connor, John J.; Robertson, Edmund F., "Stanisław Leśniewski", MacTutor History of Mathematics archive, University of St Andrews.