(not (SpatioTemporalRegionPartOf ())
(forall (x) (not SpatioTemporalRegionPartOf x) )
(forall (x y z ...s) (not (SpatioTemporalRegionPartOf x y z ...s) )
(forall
((x SpatioTemporalRegion) (y SpatioTemporalRegion))
(if
(not
(SpatioTemporalRegionPart x y)
)
(exists
(z)
(SpatioTemporalRegionDifference x y z)
)
)
Difference