2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/131620We prove an Alexander type theorem for the spectral unit ball $Ω_n$ showing that there are no non-trivial proper holomorphic mappings in $Ω_n$, $n\geq 2$.6 pagesComplex VariablesSpectral Theory32H35text