C-class and pair upper class functions and other kind of contractions in fixed point theory

Abstract

In 2014 was introduced C-class and pair upper Class functions that cover more papers before and after that .base on them some other ideas like :1-1-upclass functions, multiplicative C-class functions, inverse-C-class functions,CF-simulation functions were planed. In this glance we look for some condition that can use them or can not.