Degree-refined algebraic versus geometric multiplicity conjecture for tensor eigenvalues

Let n,dn,d be positive integers, let T,tCn((Cn))dT,\mathbf{t}\in\mathbb{C}^n\otimes((\mathbb{C}^n)^*)^{\otimes d}, and assume that t\mathbf{t} is non-singular. For λ0C\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 λ0C\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.

Sources & referencesView supporting material

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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