Hierarchical fuzzy systems have been an increasingly prevalent research topic, however,
most of them are with fixed structures. This could reduce the flexibility of the method in …

In this paper, we present and apply a new aggregation principle for hesitant fuzzy elements
(HFEs). First, we introduce a membership uncertainty index of the HFEs. Then we present a …

Recently, an extension of typical hesitant fuzzy element (HFE) called the ordered weighted
hesitant fuzzy element (OWHFE) has been proposed to allow the membership of a given …

Hesitant fuzzy set (HFS) as an effective tool to reflect human's hesitancy has received great
attention in recent years. The importance weights of possible values in hesitant fuzzy …

Hesitant fuzzy element (HFE), membership degree of which consists of a set of crisp values,
is used as an expression form when the decision makers encounter hesitance in providing …

Hesitant fuzzy linguistic term set (HFLTS), which permits decision makers to use several
linguistic terms to assess a variable, is a useful tool to deal with situations in which people …

Hesitant fuzzy sets (HFSs) are becoming more and more popular in the fuzzy domain and
attract great attentions. As an important research orientation of HFSs, the correlation …

The dual hesitant fuzzy set (DHFS) is a useful tool to deal with situations in which people are
hesitant about providing their satisfaction degree and dissatisfaction degree. In this paper …

Hesitant fuzzy linguistic term sets (HFLTSs), one of the extensions of the hesitant fuzzy sets,
are used to deal with several possible linguistic values or richer expressions than a single …

In practice, when the frequency of a linguistic term in evaluation information is greater than
one, a consensus has been reached and this frequency is regarded to be one by default …