Real-part largest-eigenvalue conjecture for the permanent matrix

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Let Hn\mathcal{H}_n be the set of n×nn\times n positive semidefinite Hermitian matrices. For A=[ai,j]∈HnA=[a_{i,j}]\in\mathcal{H}_n, let A(i,j)A(i,j) be obtained by deleting row ii and column jj, and define FA=[fi,j]F_A=[f_{i,j}] by

fi,j=ai,jper⁡(A(i,j)).f_{i,j}=a_{i,j}\operatorname{per}(A(i,j)).

Let λmax⁡R(FA)\lambda_{\max}^{\mathbb{R}}(F_A) denote the maximum eigenvalue of the symmetric part of FAF_A over Rn×n\mathbb{R}^{n\times n}, formed by taking the real part of each entry of FAF_A. Real-part eigenvalue conjecture. For every A∈HnA\in\mathcal{H}_n,

λmax⁡R(FA)≤per⁡(A).\lambda_{\max}^{\mathbb{R}}(F_A)\leq\operatorname{per}(A).

The supplied text does not give evidence resolving this newly introduced conjecture, so its database status remains open.

References

Primary source

Léo Pioge, Kamil K. Pietrasz, Benoit Seron, Leonardo Novo and Nicolas J. Cerf, “A logical implication between two conjectures on matrix permanents”, arXiv:2508.00111 (2025).

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