Abstract:Two skew diagrams are defined to be equivalent if their corresponding skew Schur functions are equal. The equivalence classes of ribbons (edgewise connected skew diagrams without a $2\times 2$ block of boxes) have been classified by Billera, Thomas and van Willigenburg in 2006.
In this paper, we provide a complete characterization of the equivalence classes of connected skew diagrams with exactly one inclusion-maximal $2\times m$ or $m\times 2$ block of boxes for every $m\ge 2$. In particular, the possible sizes of such equivalence classes are one, two, or four, demonstrating that a single $2\times m$ or $m\times 2$ block dramatically reduces the sizes of equivalence classes. Our result confirms special cases of the elusive conjecture on equivalent connected skew diagrams proposed by McNamara and van Willigenburg in 2009.
From: Shu Xiao Li [view email]
[v1]
Mon, 4 Mar 2024 08:50:31 UTC (65 KB)
[v2]
Thu, 30 Jul 2026 15:16:49 UTC (86 KB)
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