(Forall (?Physdim ?Spatdim)
(Abelian-Group (Dyad-Of-Dimensions ?Physdim ?Spatdim)
+
(The-Zero-Dyad-Of-Type ?Spatdim ?Physdim)))
(<- (Dyad-Of-Dimensions ?Physim ?Spatdim)
(If (And (Physical-Dimension ?Physim)
(Positive-Integer ?Spatdim))
(Kappa (?Vq)
(And (Dyad ?Vq)
(= (Spatial.Dimension ?Vq) ?Spatdim)
(= (Quantity.Dimension ?Vq) ?Physim)))))