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1 topic
Project-declaredLean 4.32.1

Replacement rel exists Unique of mem exists Unique

LO.FirstOrder.SetTheory.replacement_rel_existsUnique_of_mem_existsUnique

Project documentation

A stronger variant of (unique existence of) replacement, which only requires uniqueness on X. The statement of this lemma is thanks to tosiaki.

formal logicmetatheoryproof theory

Source project: Foundation

Person-level attribution pending.

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