(Forall (?D)
(=> (Physical-Dimension ?D)
(Abelian-Group (Scalar-Quantities-Of-Dimension ?D)
+
(The-Zero-Scalar-For-Dimension ?D))))
(<- (Scalar-Quantities-Of-Dimension ?Dimension)
(If (Physical-Dimension ?Dimension)
(Kappa (?Q)
(And (Scalar-Quantity ?Q)
(= (Quantity.Dimension ?Q) ?Dimension)))))
(=> (= (Scalar-Quantities-Of-Dimension ?Dimension) ?Class)
(Linear-Order ?Class <))
(=> (= (The-Zero-Scalar-For-Dimension ?Dimension) ?Zero-Scalar)
(Identity-Element-For ?Zero-Scalar
+
(Scalar-Quantities-Of-Dimension ?Dimension)))