2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/72511If kappa is any strongly unfoldable cardinal, then this is preserved in a forcing extension in which Diamond_kappa(REG) fails. This result continues the progression of the corresponding results for weakly compact cardinals, due to Woodin, and for indescribable cardinals, due to Hauser.25 pagesLogic03E55; 03E35; 03E05text