Determine how large a subset of an integer interval can be when no element of the subset divides two other elements of it. Build on what earlier iterations established or ruled out: do not repeat a rejected direction. Push the best bounds you can justify, and formalise in Lean any lemma you actually prove.
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Checking prior art and known barriers for: Structural characterization via maximal chains in the divisibility poset Extremal families for [1,N] are top interval plus bounded correction
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