2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106680Compatibility between the realist tenants of value-definiteness and causality is called into question by several realism impossibility proofs in which their formal elements are shown to conflict. We review how this comes about in the Kochen-Specker and von Neumann proofs and point out a connection between their key assumptions: a constraint on realist causality via additivity in the latter proof, noncontextuality in the former. We conclude that value-definiteness and contextuality are indeed not mutually exclusive.46 pages, 26 figuresQuantum Physicstext