  This principle appears frequently in the mental causation literature under a number of labels: most common are variations of Completeness of the Physical (Crane 1995, 2001; Papineau 1993, 2000; O’Connor and Churchill 2010) or Physical Closure (Crane 1992; Baker 1993; Melnyk 2003; Kim 2005). We’ll call it Completeness for short.