Conjectural resolution counts for Type I four-dimensional quiver varieties

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Let N(\I(\D[4],n))N(\I(\D[4],n)), N(\I(\D[m],1))N(\I(\D[m],1)), N(\I(\D[m],n)′)N(\I(\D[m],n)'), N(\I(\D[m],0)′)N(\I(\D[m],0)'), N(\I(\E[6,7],n))N(\I(\E[6,7],n)), and N(\I(m))N(\I(m)) denote the numbers of projective crepant resolutions for the indicated Type \I\I dimension vectors. Type I resolution-count conjecture. For certain dimension vectors in Type \I\I, these numbers are

N(\I(\D[4],n))=n+33(n+55),N(\I(\D[4],n))=\frac{n+3}{3}\binom{n+5}{5}, N(\I(\D[m],1))=2m−1,N(\I(\D[m],1))=2^{m-1}, N(\I(\D[m],n)′)=2(m+n−1)n!∏i=1n−1(2m+i−2),N(\I(\D[m],0)′)=1,N(\I(\D[m],n)')=\frac{2(m+n-1)}{n!}\prod_{i=1}^{n-1}(2m+i-2),\qquad N(\I(\D[m],0)')=1,

N(\I(\E[6,7],n))N(\I(\E[6,7],n)) coincides with the dimensions of multiples of the minimal representation of the \E[6,7]\E[6,7] complex Lie algebra, and

N(\I(m))=∏i=0m−1(2i)!(m+2i+1)!(3i+1)!(m+i)!,N(\I(m))=\prod_{i=0}^{m-1}\frac{(2i)!(m+2i+1)!}{(3i+1)!(m+i)!},

which coincides with the number of totally symmetric plane partitions fitting in an m×m×mm\times m\times m box. These formulas are presented as computer-aided numerology based on computed cases, and the source does not explicitly establish their conjectural status or resolution.

References

Primary source

Samuel Lewis and Pavel Shlykov, “Nakajima quiver varieties in dimension four”, arXiv:2510.15160 (2025).

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