Any Legal-Entity that participates in at least one of:
- the Actual-Customer relationship with respect to some Sale,
- the Potential-Customer relationship with respect to some Potential-Sale,
- the Specified-Potential-Customer Relationship with some Sale-Offer
(=> (Customer ?X)
(Or (Exists (?Sale) (Actual-Customer ?Sale ?X))
(Exists (?Potential-Sale)
(Potential-Customer ?Potential-Sale ?X))
(Exists (?Sale-Offer)
(Specified-Potential-Customer ?Sale-Offer ?X))))
(<=> (Customer ?X)
(And (Legal-Entity ?X)
(Actor ?X)
(Or (Exists (?Sale) (Actual-Customer ?Sale ?X))
(Exists (?Potential-Sale)
(Potential-Customer ?Potential-Sale ?X))
(Exists (?Sale-Offer)
(Specified-Potential-Customer ?Sale-Offer ?X)))))
(=> (Market-Need ?Need)
(Exists (?Customer)
(And (Customer ?Customer)
(Has-Need ?Customer ?Need)
(Not (Exists (?For-Sale ?Product ?Feature)
(And (Product-For-Sale ?For-Sale
?Product)
(Has-Feature ?Product ?Feature)
(Satisfies-Need ?Feature ?Need)))))))
(=> (Set-Of-Customers ?Customers)
(Forall (?X) (=> (Member ?X ?Customers) (Customer ?X))))
(<=> (Set-Of-Customers ?Customers)
(And (Eo-Set ?Customers)
(Set ?Customers)
(Forall (?X) (=> (Member ?X ?Customers) (Customer ?X)))))