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    Elementary Topology, 2nd ed. Michael C. Gemignani
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    1. chrisaldrich 30 Sep 2024
      Z orn ’s lemma. Suppose S, < is a partially ordered set with the property that every chain in S has an upper bound. Then S contains amaximal element.

      typo : < should be ≤

      Zorn's lemma lemmas partially ordered sets axiom of choice definitions

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