Abstract
We introduce the class of extended simulation functions, which is more large than the class of simulation functions, recently introduced in (Khojasteh et al. Filomat 29(6):1189-1194, 2015). We obtain a -admissibility result involving extended simulation functions, for a new class of mappings , with respect to a lower semi-continuous function , where X is a set equipped with a certain metric d. The main theorem in this paper generalizes a recent -admissibility result obtained in (KarapA +/- nar et al. Fixed Point Theory Appl 2015:152, 2015), and many other related results.