2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/143931We give a positive answer to a question of Herman, Baker and Rippon by showing that, in the exponential family, the boundary of every unbounded Siegel disk contains the singular value.4 pages, 1 figure; appeared as preprint 02/7 in the Berichtsreihe des Mathematischen Seminars der CAU Kiel (2002)Dynamical SystemsComplex Variables37F10 (primary) 30D05 (secondary)text