“…This famous principle is a very useful tool for the existence and uniqueness of the solution of problems in various fields such as differential equations, integral equations, partial differential equations. Because of its applicability, many authors have studied to generalize this principle [4,8,16,18,24,26,27]. One of the interesting and famous generalizations was proved by Nadler [22] by taking into account multivalued mappings on metric spaces as follows.…”