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