In descriptive set theory, 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.
Read more about Wadge Hierarchy: Wadge Degrees, Wadge and Lipschitz Games, Structure of The Wadge Hierarchy, Other Notions of Degree
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“In a hierarchy every employee tends to rise to his level of incompetence.”
—Laurence J. Peter (1919–1990)