Degree-refined algebraic versus geometric multiplicity conjecture for tensor eigenvalues

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Let n,dn,d be positive integers, let T,t∈Cn⊗((Cn)∗)⊗dT,\mathbf{t}\in\mathbb{C}^n\otimes((\mathbb{C}^n)^*)^{\otimes d}, and assume that t\mathbf{t} is non-singular. For λ0∈C\lambda_0\in\mathbb{C}, let Et,T(λ0)E_{\mathbf{t},T}(\lambda_0) be the eigenscheme of t\mathbf{t}-eigenvectors of TT with eigenvalue λ0\lambda_0, and call E1,…,EsE_1,\dots,E_s its irreducible components. Let deg⁡(Ei)\deg(E_i) and dim⁡(Ei)\dim(E_i) denote their degrees and dimensions, and let amt,T(λ0)\mathop{\rm am}\nolimits_{\mathbf{t},T}(\lambda_0) be the algebraic multiplicity. Degree-refined algebraic versus geometric multiplicity conjecture. For λ0∈C\lambda_0\in\mathbb{C},

amt,T(λ0)≥∑i=1sdeg⁡(Ei)dim⁡(Ei)ddim⁡(Ei)−1.\mathop{\rm am}\nolimits_{\mathbf{t},T}(\lambda_0)\ge\sum_{i=1}^s \deg(E_i)\dim(E_i)d^{\dim(E_i)-1}.

This is presented as a stronger refinement of the algebraic-versus-geometric multiplicity conjecture because it incorporates the scheme-theoretic degrees of the irreducible components. The supplied text gives no general resolution.

References

Primary source

Stefano Canino, Cosimo Flavi, Francesco Galuppi and Yuze Luan, “New conjectures on multiplicities of tensor eigenvalues”, arXiv:2607.21422 (2026).

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