%0 Journal Article
%T Some remarks of Jan Śleszyński regarding foundations of mathematics of
	Stanisław Leśniewski
%A Obojska, Lidia
%J Czasopismo Techniczne
%V 2015
%R 10.4467/2353737XCT.15.219.4424
%N Nauki Podstawowe Zeszyt 2-NP (20) 2015
%P 235-245
%K foundations of mathematics, set theory, element, set
%@ 0011-4561
%D 2016
%U https://ejournals.eu/czasopismo/czasopismo-techniczne/artykul/some-remarks-of-jan-sleszynski-regarding-foundations-of-mathematics-of-stanislaw-lesniewski
%X 
	Jan Śleszyński, a great mathematician, is considered a pioneer of Polish logic; however, he was not connected with the famous Warsaw School of Logic (WSL). He believed that his mission was a critical evaluation of work of other logicians in the field of foundations of mathematics and proof theory. Among his writings we find several notes regarding the work of Stanisław Leśniewski (the co-founder of the WSL) and his collective set theory. These remarks are the subject of investigation of the presented paper.