The Denjoy-Young-Saks theorem describes, for an arbitrary real function, the possible combinations of values its four Dini derivatives can take at almost every point. Denjoy proved the result for continuous functions, Young extended it to measurable functions, and Saks extended it further to arbitrary functions; Saks and Bruckner have given historical accounts of the theorem. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
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Entity-backed identity for the statement-form enum value this theorem already carries, resolved to a mathematics concept by an explicit value-to-entity map (phase 3 bucket conversion, docs\design_entity_backed_browse_buckets_20260928.md). The statement-form fact itself stays on the theorem unchanged.
Sources
1. Denjoy-Young-Saks Theorem (Wikipedia)
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