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Wadge hierarchy
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<p>In <a href="/facts/Descriptive_set_theory/ek0tvUXb">descriptive set theory</a>, within <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, Wadge degrees are levels of complexity for sets of <a href="/facts/Real_number/R02gw5Pb">reals</a>. Sets are compared by <a href="/facts/Continuous_function/sKbl02pB">continuous</a> reductions. The Wadge hierarchy is the structure of Wadge degrees. These concepts are named after William W. Wadge. </p>