The ?spatdim dimensional zero vector of physical dimension ?physdim.
(Nth-Domain The-Zero-Vector-Of-Type 2 Physical-Dimension) (Nth-Domain The-Zero-Vector-Of-Type 1 Positive-Integer) (Nth-Domain The-Zero-Vector-Of-Type 3 Vector-Quantity)
(Forall (?Physdim ?Spatdim)
(Abelian-Group (Vector-Quantities-Of-Dimensions ?Physdim
?Spatdim)
+
(The-Zero-Vector-Of-Type ?Spatdim ?Physdim)))
(=> (And (Vector-Quantity ?X) (- ?X ?Y))
(And (Vector-Quantity ?Y)
(= (+ ?X ?Y)
(The-Zero-Vector-Of-Type (Quantity.Dimension ?X)
(Spatial.Dimension ?X)))))
(=> (= (The-Zero-Vector-Of-Type ?Spatdim ?Physdim) ?V0)
(Forall (?V)
(=> (Vector-Quantity ?V)
(= (Dot ?V ?V0)
(The-Zero-Scalar-For-Dimension ?Physdim)))))