University of KashanIranian Journal of Mathematical Chemistry2228-64899220180601On the Eigenvalues of some Matrices based on Vertex Degree1491566346510.22052/ijmc.2017.93637.1303ENS.ZangiDepartment of Mathematics, Shahid Rajaee Teacher Training UniversityM.GhorbaniDepartment of mathematics, Shahid Rajaee Teacher Training University0000-0002-5324-0847M.EslampourDepartment of Mathematics, Shahid Rajaee Teacher Training UniversityJournal Article20170726The aim of this paper is to compute some bounds of forgotten index and then we present spectral properties of this index. In continuing, we define a new version of energy namely ISI energy corresponded to the ISI index and then we determine some bounds for it.https://ijmc.kashanu.ac.ir/article_63465_857967802a59a68b050043de1148f170.pdf