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Apr 17 at 11:56 comment added Sam Hopkins For your last identity $\clubsuit$, see also for instance Corollary 7.13.8 of Stanley's EC2.
Apr 17 at 7:39 history edited Fedor Petrov CC BY-SA 4.0
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Apr 17 at 6:58 history edited Fedor Petrov CC BY-SA 4.0
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Apr 17 at 6:04 history answered Fedor Petrov CC BY-SA 4.0