The change-of-basis coefficients between the dual canonical and MV bases

Let LL be a finite-dimensional simple module over the relevant KLR algebra, let dLd_L be the corresponding vector in the dual canonical basis of C[N]{\mathbb C}[N], and let bZb_Z be the MV-basis vector corresponding to an MV cycle ZZ. For each LL and ZZ, let nL,Zn_{L,Z} be the non-negative integer defined by the multiplicity of ZZ in the scheme-theoretic support of the associated graded module constructed from LL. Change-of-basis conjecture. The change of basis from the dual canonical basis to the MV basis is given by the non-negative integers nL,Zn_{L,Z}; equivalently, the expansion of each dLd_L in the MV basis has coefficients nL,Zn_{L,Z}. The preceding theorem establishes the corresponding equality after applying the bar-character map, providing evidence for this conjecture; its general validity is left open.

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Primary source

Alexis Leroux-Lapierre, “Category O and asymptotic characters”, arXiv:2507.16215 (2025).

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