2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36684Simple changes of the radial co-ordinate deprive Kerr's spinning corpuscle of its marvellous properties.4 pages, PDF from MS-Word97, submitted to Il Nuovo Cimento, Section B, pag.1 first row after eq.(1): replaced "a and r are nonnegative parameters" with "a and M are nonnegative parameters"General Relativity and Quantum CosmologyAstrophysicstext