2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/136638M. E. Cesaro (1885) gave a quite remarkable expression for the Bell number --the number of partitions of an n-element set -- as a definite integral. This note is an exposition, correcting a typographical error in the original.3 pagesHistory and Overview05A18text