The purpose of this tutorial paper is to make general type-2 fuzzy logic systems (GT2 FLSs)
more accessible to fuzzy logic researchers and practitioners, and to expedite their research …

In this paper, we propose a variety of distance measures for hesitant fuzzy sets, based on
which the corresponding similarity measures can be obtained. We investigate the …

We introduce the idea of generalized orthopair fuzzy sets, which provide an extension of
intuitionistic fuzzy sets. The basic properties of these generalized orthopair fuzzy sets are …

In this state-of-the-art paper, important advances that have been made during the past five
years for both general and interval type-2 fuzzy sets and systems are described. Interest in …

Interval type-2 fuzzy logic controllers (IT2 FLCs) have recently been attracting a lot of
research attention. Many reported results have shown that IT2 FLCs are better able to …

With the demand for knowledge-handling systems capable of dealing with and
distinguishing between various facets of imprecision ever increasing, a clear and formal …

Ranking methods, similarity measures and uncertainty measures are very important
concepts for interval type-2 fuzzy sets (IT2 FSs). So far, there is only one ranking method for …

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 …

Type-1 fuzzy sets can model the linguistic uncertainty from a single user, ie, intra-personal
uncertainty. Type-1 fuzzy systems have been widely used in controls and machine learning …

In this paper, we will present a wider view on the relationship between interval-valued fuzzy
sets and interval type-2 fuzzy sets, where we will show that interval-valued fuzzy sets are a …