They're not degrees, but one of these things named for Wadge characterizes the complexity of sets of reals.
The  polynomial  one of these things generalizes certain complexity classes to oracle machines. They're not degrees, but one of these things named for Wadge characterizes the complexity of sets of reals. One of these things named for Borel strati es a Borel algebra, and the  arithmetical  one of these things classi es sets based on the complexity of the formulas used to de ne them. These things are said to collapse if they have only  nitely many elements, which are also called    levels . For ten points, identify these objects in set theory which consist of a preorder de ned on a set.
The  polynomial  one of these things generalizes certain complexity classes to oracle machines.
hierarchies [accept word forms]