Problems Contributed By Individual Authors
A total of 193 problems were written down in the book.
Stanisław Mazur contributed a total of 43 problems, 24 of them as a single author and 19 together with Stefan Banach. Banach himself wrote 14, plus another 11 with Stanislaw Ulam and Mazur. Ulam wrote 40 problems and additional 15 ones with others.
During the Soviet occupation of Lwów, several Russian mathematicians visited the city and also added problems to the book.
Hugo Steinhaus contributed the last one in May 1941 (other sources give March 1941), which involved a question about the likely distribution of matches within a matchbox — a problem motivated by Banach's habit of chain smoking cigarettes — shortly before the German attack on the Soviet Union.
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