In computational complexity theory, the polynomial hierarchy is a hierarchy of complexity classes that generalize the classes NP and co-NP. Each class in the hierarchy is contained within PSPACE. The...
An object hierarchy is a concept from computer programming. It references descendants of objects acting as properties of an object. An example of this would be the object controlling a...
The boolean hierarchy is the hierarchy of boolean combinations of NP sets. Equivalently, the boolean hierarchy can be described as the class of boolean circuits over NP predicates. A collapse...
The urban hierarchy of Brazil places Brazil's cities into categories: global cities, national metropolises, regional metropolises, regional capitols , sub-regional centers and zone centers.
