Add Erdős Problem 1173 (set mappings on ω_{ω+1} under GCH)#3794
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henrykmichalewski wants to merge 2 commits intogoogle-deepmind:mainfrom
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Add Erdős Problem 1173 (set mappings on ω_{ω+1} under GCH)#3794henrykmichalewski wants to merge 2 commits intogoogle-deepmind:mainfrom
henrykmichalewski wants to merge 2 commits intogoogle-deepmind:mainfrom
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Mirrors the Round C docstring pass from the private repo's phase1-infrastructure branch. Each Lean file now carries the canonical source statement and upstream URL inline so reviewers can verify formalization against the source without navigating away from the diff.
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Formalizes Erdős Problem 1173 on set mappings and free sets on
ω_{ω+1}under GCH.Contents
IsSetMappingdefinition (a set mappingf : α → Set αwithx ∉ f xand a size bound).IsFreeSetdefinition (a subset pairwise disjoint from the mapping's images).IsSetMappingin the size boundCloses #1996
Assisted by Claude (Anthropic).