Hesitant fuzzy sets are very useful to deal with group decision making problems when
experts have a hesitation among several possible memberships for an element to a set …

Pythagorean fuzzy sets (PFSs), hesitant fuzzy sets (HFSs) and intuitionistic hesitant fuzzy
sets (IHFSs) have attracted more and more scholars' attention due to their powerfulness in …

As a generalization of fuzzy set, hesitant fuzzy set is a very useful tool in situations where
there are some difficulties in determining the membership of an element to a set caused by a …

In this study, we extend the hesitant fuzzy set (HFS) to its higher order type and refer to it as
the higher order hesitant fuzzy set (HOHFS). HOHFS is the actual extension of HFS that …

When people make a decision, they are usually hesitant and irresolute for one thing or
another which makes it difficult to reach a final agreement. For example, two decision …

Hesitant fuzzy sets (HFSs) and generalized hesitant fuzzy sets (GHFSs) provide useful tools
for uncertain information processing in situations in which decision makers have doubts …

Hesitant fuzzy set (HFS), which permits the membership having a set of possible values, has
turned out to be a powerful structure in expressing uncertainty and vagueness. In this paper …

Dual hesitant fuzzy sets (DHFSs), originally introduced by Zhu et al.[23], are a new tool to
handle fuzziness considering the membership and nonmembership degrees by a set of …

A dual hesitant fuzzy set (DHFS) consists of two parts, that is, the membership hesitancy
function and the nonmembership hesitancy function, supporting a more exemplary and …

As a fuzzy set extension, the hesitant set is effectively used to model situations where it is
allowable to determine several possible membership degrees of an element to a set due to …