 As Healey (1991, p. 411) shows, spatiotemporal separability entails spatial separability, and so spatial nonseparability entails spatiotemporal nonseparability. Because it is both more general and more consonant with a geometric spacetime viewpoint, it seems reasonable to consider spatiotemporal separability to be the primary notion. Accordingly, separability without further qualification will mean spatiotemporal separability in what follows, and nonseparability will be understood as its denial.