1. Optimality conditions for invex nonsmooth optimization problems with fuzzy objective functions

   • Tadeusz Antczak

   OriginalPaper Open access 22 February 2022 Pages: 1 - 21

   

2. ELECTRE II method based on the cosine similarity to evaluate the performance of financial logistics enterprises under double hierarchy hesitant fuzzy linguistic environment

   • Ruichen Zhang
   • Zeshui Xu
   • Xunjie Gou

   OriginalPaper 03 February 2022 Pages: 23 - 49

   

3. Robust optimality analysis of non-degenerate basic feasible solutions in linear programming problems with fuzzy objective coefficients

   • Masahiro Inuiguchi
   • Zhenzhong Gao
   • Carla Oliveira Henriques

   OriginalPaper Open access 16 February 2022 Pages: 51 - 79

   

4. Building the hierarchical Choquet integral as an explainable AI classifier via neuroevolution and pruning

   • Jih-Jeng Huang

   OriginalPaper 02 March 2022 Pages: 81 - 102

   

5. Parameter estimation for uncertain fractional differential equations

   • Liu He
   • Yuanguo Zhu
   • Ziqiang Lu

   OriginalPaper 08 April 2022 Pages: 103 - 122

   

6. Uncertain energy model for electricity and gas futures with application in spark-spread option price

   • Farshid Mehrdoust
   • Idin Noorani
   • Wei Xu

   OriginalPaper 29 April 2022 Pages: 123 - 148

   

7. Type-1 and singleton fuzzy logic system binary classifier trained by BFGS optimization method

   • Pedro H. S. Calderano
   • de Castro Ribeiro Mateus Gheorghe
   • Ivan F. M. Menezes

   OriginalPaper 22 April 2022 Pages: 149 - 168