theorem instTwoDimensionalSpatialRegionIsToParent
theorem instTwoDimensionalSpatialRegionIsToParent: ∀ (x : Type) [TwoDimensionalSpatialRegion.Is x], SpatialRegion.Is x
theorem instTwoDimensionalSpatialRegionIsToParent
theorem instTwoDimensionalSpatialRegionIsToParent: ∀ (x : Type) [TwoDimensionalSpatialRegion.Is x], SpatialRegion.Is x