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Aug 21, 2021 at 6:22 comment added Tony Huynh I have now added an example that fails both (1) and (2).
Aug 21, 2021 at 6:21 history edited Tony Huynh CC BY-SA 4.0
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Aug 21, 2021 at 3:09 history edited Tony Huynh CC BY-SA 4.0
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Aug 21, 2021 at 2:21 comment added Richard Stanley Can you give an example of a subset $S$ that fails to satisfy (1) or (2)?
Aug 20, 2021 at 5:11 history edited Tony Huynh CC BY-SA 4.0
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Aug 20, 2021 at 3:01 history edited Tony Huynh CC BY-SA 4.0
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Aug 20, 2021 at 2:53 history answered Tony Huynh CC BY-SA 4.0