A simple explicit bijection between (n, 2) Gog and Magog trapezoids
Résumé
A sub-problem of the open problem of finding an explicit bijection between alternating sign matrices and totally symmetric self-complementary plane partitions consists in finding an explicit bijection between so-called (n, k) Gog trapezoids and (n, k) Magog trapezoids. A quite involved bijection was found by Biane and Cheballah in the case k = 2. We give here a simpler bijection for this case.
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