issue 4 publication date 2020-08-01

• cover merge 17-4 August 2020
• Product operation and joint interval valued observable
• Fuzzy particle swarm optimization with nearest-better neighborhood for multimodal optimization
• Solving matrix games with hesitant fuzzy pay-offs
• General definitions for the union and intersection of ordered fuzzy multisets
• Multi-criteria IT personnel selection on intuitionistic fuzzy information measures and ARAS methodology
• Uncertainty analysis of hierarchical granular structures for multi-granulation typical hesitant fuzzy approximation space
• Refining membership degrees obtained from fuzzy C-means by re-fuzzification
• A robust least squares fuzzy regression model based on kernel function
• Alternative approaches to obtain t-norms and t-conorms on bounded lattices
• Fuzzy convergence structures in the framework of L-convex spaces
• A modification of probabilistic hesitant fuzzy sets and its application to multiple criteria decision making
• A novel fuzzy multi-criteria decision-making methodology based upon the spherical fuzzy sets with a real case study
• Reliable hub-and-spoke network design problems under uncertainty through multi-objective programming
• Persian-translation 17-4 August 2020