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) (=> (The-Zero-Vector-Of-Type ?Spatdim ?Physdim ?V0) (Forall (?V) (=> (Vector-Quantity ?V) (= (Dot ?V ?V0) (The-Zero-Scalar-For-Dimension ?Physdim)))))