Characteristic Polynomial Coefficients Do Not Fully Identify Totally Positive Matrices

arXiv·low signal

Tiago Closs and Leandro Farina (arXiv 2607.18148, cs.LG/math.RA) investigate whether the highest-order coefficients of a characteristic polynomial suffice to distinguish totally positive matrices. Pure linear-algebra theory cross-listed to cs.LG with no benchmarks or implementation. Included for completeness of the day's cs.LG sweep; no builder action.