The permutation reconstruction conjecture for simple eigenvectors of hypomorphic matrices

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Let AA and BB be two hypomorphic matrices, meaning that B=Σ(A)B=\Sigma(A) for a hypomorphism Σ\Sigma as in the surrounding reconstruction setting. Let λi\lambda_i be a simple eigenvalue of AA, and write eigen⁡λi(A)\operatorname{eigen}_{\lambda_i}(A) and eigen⁡λi(B)\operatorname{eigen}_{\lambda_i}(B) for the corresponding one-dimensional eigenspaces. Permutation reconstruction conjecture. There exists a permutation matrix τ\tau such that

τ eigen⁡λi(A)=eigen⁡λi(B).\tau\,\operatorname{eigen}_{\lambda_i}(A)=\operatorname{eigen}_{\lambda_i}(B).

The claim proposes that every simple eigenspace is reconstructible up to a permutation of coordinates. The supplied context establishes related reconstruction results for simple eigenvalues whose eigenspaces are not orthogonal to the all-ones vector, but does not resolve this full assertion for arbitrary simple eigenvalues.

References

Primary source

Hongyu He, “Eigenvectors and Reconstruction”, arXiv:math/0607142 (2006).

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