The Fermatean hesitant fuzzy set idea obtained by combining sets and can be used in practice to simplify the solution of complicated multi-criteria decision-making problems. Initially, notion a has been given, operations related this concept have presented. basic properties aggregation operators based on studied. To choose best alternative practice, novel method that is with created. Finally, n...

in the process of investment decision making, next to financial indicators many other aspects of investment projects are increasingly often considered. this leads to the multi-criteria evaluation of a project. the advantage of multi-criteria methods is the ability to take into account all (not only financial) aspects of the attractiveness of an investment project. the selection of criteria of p...