Individual Volterra–Lyapunov stability implies a non-square D-stability-like property

Let ARm×nA\in\mathbb{R}^{m\times n} be a real nonsquare matrix. Let M\mathcal{M} be the index set consisting of kk-tuples of integers in the range 1,,m1,\ldots,m. For jMj\in\mathcal{M}, let [AEK]j[AEK]_j denote the corresponding matrix associated with the block diagonal non-square matrix KCn×mK\in\mathbb{C}^{n\times m}, and let Re{σi(M)}\operatorname{Re}\{\sigma_i(M)\} denote the real part of the ii-th eigenvalue of a matrix MM. Individual Volterra–Lyapunov stability conjecture. If AA is an individual Volterra–Lyapunov stable matrix, then there exists a block diagonal non-square matrix KCn×mK\in\mathbb{C}^{n\times m} such that, for every non-negative diagonal matrix ERn×nE\in\mathbb{R}^{n\times n} and every jMj\in\mathcal{M},

Re{σi([AEK]j)}>0.\operatorname{Re}\{\sigma_i([AEK]_j)\}>0.

The claim proposes a sufficient spectral property associated with individual Volterra–Lyapunov stability for nonsquare matrices; the supplied text does not establish it or provide evidence that it has been resolved.

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Primary source

Steven W. Su, “Special Stable Matrices and Their Non-square Counterpart”, arXiv:2401.00367 (2023).

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