Multiplicity refinement for specialized spectral-invariant varieties

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Let V(I′)V(I') be the affine variety defined by the specialized ideal I′I' associated with the specialized spectral-invariant system, and let qq denote the period. A point is regular when it is nonsingular, and multiplicity refers to its scheme-theoretic multiplicity. Multiplicity refinement conjecture. If qq is odd, then V(I′)V(I') has only regular nonzero points. If qq is even and greater than 66, then, up to symmetry, V(I′)V(I') has a single singular point of multiplicity 2q2−22^{\frac{q}{2}-2}. Moreover, the multiplicity at the zero point is

2⌊q2⌋.2^{\left\lfloor \frac{q}{2}\right\rfloor}.

This refinement is based on computational data for the specialized variety and remains unresolved in the supplied text.

References

Primary source

Matthew Faust, Leo Friedman, Gavin O'Malley, Rolando Ramos and Aaryan Sharma, “Algebraic Properties of the Ideal of Spectral Invariants for the Discrete Laplacian”, arXiv:2602.08304 (2026).

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