   Of the students that Leśniewski had taught at Warsaw, some went on to logical and philosophical careers of their own, most notably Tarski, whom Leśniewski correctly recognized as a genius, and who went on to outshine his teacher. Among those who stayed fairly close to Leśniewski’s own views were Jerzy Słupecki, Bolesław Sobociński, Czesław Lejewski, and Henry Hiż. The first three in particular contributed after World War II to the reconstruction of many of the logical results that had been lost in 1944. Serendipitously recovered students’ notes from Leśniewski’s lectures, translated and published in 1988, give some idea of the detail of Leśniewski’s teaching, but his lectures ranged more widely than the extant works show. At all times however, Leśniewski’s logical position was a minority one, which was respected while being rejected, and it won few converts after his death. The reasons for his sidelining have been analysed by Grzegorczyk (1955). Leśniewski’s work was developed in the 1920s when an axiomatic approach was standard, as in Hilbert’s school, but his negative attitude to semantics as a separable part of logic meant he was unsympathetic to the shift towards a semantic approach initiated by Tarski, and he would have remained opposed even had he lived longer. His vituperative rejection of set theory made him no friends and many enemies among mathematicians, while his unwillingness and inability to find anything worthwhile in the works of philosophers lost him their sympathy. His obsessive concern for the minute detail of axiomatizations was unattractive to many when more streamlined methods were available, and his radical nominalism made the presentation of logic according to his principles a matter of extreme inconvenience. Even Tarski, who was initially very much a follower, had to admit that Leśniewski’s conception of logical systems as concrete collections of inscriptions growing in time through the addition of new theses made them “thoroughly unrewarding objects for methodological and semantic research”.