Numerical methods 2 Portfolio selection Behavioral research 1 Conjugate gradient 1 Conjugate gradient method 1 Conjugate-gradient method 1 Consensus process 1 Decision making 1 Decision theory 1 Deviation function 1 Finding solutions 1 Function evaluation 1 Fuzzy sets 1 Global conver-gence 1 Group Decision Making 1 Group decision making 1 Group intelligence 1 Group theory 1 Hesitant fuzzy numbers 1 Nonlinear conjugate gradient algorithms 1 Nonlinear programming 1 Optimal portfolios 1 Portfolio selection problems 1 Prospect theory 1 Strong wolfe line search 1 Uncertain environments 1 Unconstrained optimization 1 Wolfe line searches 1 global convergence 1 portfolio selection 1