Zieliński, Marcin. 2019. “Cardinality of the Sets of All Bijections, Injections and Surjections”. Annales Universitatis Paedagogicae Cracoviensis | Studia Ad Didacticam Mathematicae Pertinentia 11 (December):143-51. https://doi.org/10.24917/20809751.11.8.