Descriptive set theory | Mathematical logic hierarchies

Wadge hierarchy

In descriptive set theory, within mathematics, Wadge degrees are levels of complexity for sets of reals. Sets are compared by continuous reductions. The Wadge hierarchy is the structure of Wadge degrees. These concepts are named after William W. Wadge. (Wikipedia).

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Related pages

Pointclass | Θ (set theory) | Closure (mathematics) | Continuous function | Borel hierarchy | Arithmetical hierarchy | Identity function | Limit ordinal | Analytical hierarchy | Game theory | Weihrauch reducibility | Veblen function | Descriptive set theory | Determinacy | Equivalence class | Preorder | Mathematics | Real number | Successor ordinal | Intersection | Axiom of determinacy | Baire space (set theory) | Difference hierarchy | Computational complexity theory | Martin measure | Open set | Cofinality