TY - GEN A1 - Rahman, Md Sadikur A1 - Shaikh, Ali Akbar A1 - Ali, Irfan A1 - Bhunia, Asoke Kumar A1 - Fügenschuh, Armin T1 - A Theoretical Framework for Optimality Conditions of Nonlinear Type-2 Interval-Valued Unconstrained and Constrained Optimization Problems Using Type-2 Interval Order Relations T2 - Mathematics KW - type-2 interval KW - type-2 interval order relations KW - type-2 interval-valued function KW - optimality KW - generalized KKT conditions Y1 - 2021 U6 - https://doi.org/10.3390/math9080908 SN - 2227-7390 VL - 9 IS - 8 ER -