Improved parameter range for the eta-expanded identifiability theorem

From papers

Let rr be the number of coordinates, let q=(qi)q=(q_i) be the vector appearing in Theorem, and let η\eta be its expansion parameter. The preceding discussion concerns the separable case, where HH is 11-expanded and qq has sum 11 with 0<q<e0<q<e.

Improved eta-expanded theorem. The thesis of Theorem

holdsifholds if

q_i>\frac{1-\eta}{r}

for every $i$. This would improve the sufficient condition $0<q<e/2$ supplied by Theorem

in the separable case and extend the range in which the associated solution is guaranteed to be correct.

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Sources & referencesView supporting material

Primary source

Maryam Abdolali, Giovanni Barbarino and Nicolas Gillis, “Dual Simplex Volume Maximization for Simplex-Structured Matrix Factorization”, arXiv:2403.20197 (2024).

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