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math.CO2025
New upper and lower bounds on the smallest singular values of nonsingular lower triangular -matrices
Vesa Kaarnioja, André-Alexander Zepernick
Let denote the set of all nonsingular lower triangular -matrices. Hong and Loewy (2004) introduced the number sequence $$ c_n=\min\{λ\midλ~\text{is an eige…
math.CO2020
Bounds on the spectrum of nonsingular triangular -matrices
Vesa Kaarnioja
Let be the set of all nonsingular lower triangular -matrices. Hong and Loewy (2004) introduced the numbers $$ c_n={\rm min}\{λ\mid λ~\text{is an eigenvalue…