On simple permanence D.S. Djordjević R.E. Harte S.Ć Živković-Zlatanović DOI: 10.2989/16073606.2014.981730 Keywords: Simply polar elements, semigroup homomorphisms Abstract “Simple permanence” is one of several variants of “spectral permanence”, which are curiously interrelated.Keywords: Simply polar elements, semigroup homomorphisms. Requires Subscription PDF Published 2016-08-11 Issue Vol. 38 No. 4 (2015) Section Articles Copyright for articles published in this journal is retained by the journal.