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Aug 10, 2020 at 16:12 vote accept bryanjaeho
Jul 18, 2020 at 23:34 comment added Ira Gessel Fedor's proof of (1) can be found in my paper with Richard Stanley, Algebraic enumeration, Handbook of Combinatorics, Vol. 2, pp. 1021–1061, Elsevier Sci. B. V., Amsterdam, 1995. dedekind.mit.edu/~rstan/pubs/pubfiles/79.pdf and in Anthony Mendes, A note on alternating permutations, Amer. Math. Monthly 114 (2007), no. 5, 437–440. jstor.org/stable/27642223.
Jul 18, 2020 at 12:36 history edited Fedor Petrov CC BY-SA 4.0
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Jul 18, 2020 at 12:01 history answered Fedor Petrov CC BY-SA 4.0