T-spherical fuzzy set is an effective tool to deal with vagueness and uncertainty in real-life
problems, especially in a situation when there are more than two circumstances, like in …

The extensions of ordinary fuzzy sets such as intuitionistic fuzzy sets (IFS), Pythagorean
fuzzy sets (PFS), and neutrosophic sets (NS), whose membership functions are based on …

The main objective of this study is to set up the foundations of a new model, namely,
complex spherical fuzzy (CSF) model that is highly proficient to express the two dimensional …

This study exploits the tremendous theory of ELimination and Choice Expressing REality
(ELECTRE) method to enhance the number of outranking approaches for the ground …

Natural gas technology selection is a critical issue for manufacturing companies.
Pythagorean fuzzy sets (PFSs) are characterized by a membership degree and a …

Intuitionistic fuzzy sets are the main source of several recent extensions of the ordinary fuzzy
sets such as Pythagorean fuzzy sets, picture fuzzy sets, neutrosophic sets and q-rung …

This study mainly aims to develop two effective and practical multi-criteria group decision-
making approaches by taking advantage of the ground-breaking theory of PROMETHEE …

The major objective of the current investigation is to build an integrated multiple criteria
group decision-making (MCGDM) methodology based on combined compromise solution …

The spherical fuzzy set (SFS), as a generalization of Picture fuzzy set, can express and
process uncertainty much better. In this article, we first reveal the comparison issues in …

In order to handle simultaneously the cardinal and ordinal information in decision-making
process, QUALIFLEX (QUALItative FLEXible multiple criteria method) is a very well-known …