TY - JOUR T1 - A Chain Rule for Reduced Functional Differential Inclusions and Stability Theorems TT - A Chain Rule for Reduced Functional Differential Inclusions and Stability Theorems AU - Gokgoz, Nurgul PY - 2025 DA - September Y2 - 2025 DO - 10.34248/bsengineering.1746300 JF - Black Sea Journal of Engineering and Science JO - BSJ Eng. Sci. PB - Karyay Karadeniz Yayımcılık Ve Organizasyon Ticaret Limited Şirketi WT - DergiPark SN - 2619-8991 SP - 1556 EP - 1560 VL - 8 IS - 5 LA - en AB - In order to represent real-world problems, modeling and stability concepts of a system are two essential steps, and functional differential inclusions become favorable among other methods because of their flexibility and robustness to handle those problems. Thus, functional differential inclusions (FDIs) provide a solid foundation for engineering problems, and the calculation of their derivatives becomes an important issue in checking the stability of them. Especially, to check the Lyapunov stability, various chain rules for FDIs are defined in the literature. In this work, a new chain rule is introduced in terms of the reduction procedure, a comparison with another one is represented, and the stability theorems in terms of Lyapunov are extended to the reduced functional differential inclusions. KW - Functional differential inclusions KW - Set-valued analysis KW - Convex analysis KW - Stability N2 - In order to represent real-world problems, modeling and stability concepts of a system are two essential steps, and functional differential inclusions become favorable among other methods because of their flexibility and robustness to handle those problems. Thus, functional differential inclusions (FDIs) provide a solid foundation for engineering problems, and the calculation of their derivatives becomes an important issue in checking the stability of them. Especially, to check the Lyapunov stability, various chain rules for FDIs are defined in the literature. In this work, a new chain rule is introduced in terms of the reduction procedure, a comparison with another one is represented, and the stability theorems in terms of Lyapunov are extended to the reduced functional differential inclusions. CR - Aitalioubrahim M, Raghib T. 2023. Functional differential inclusions with maximal monotone operators and nonconvex perturbations. Filomat, 37(20): 6793-6811. CR - Aubin JP, Cellina A. 1984. Differential inclusions: Set-valued maps and viability theory. Springer, Berlin, Germany, pp: 56-59. CR - Bacciotti A, Ceragioli F. 1999. Stability and stabilization of discontinuous systems and nonsmooth Lyapunov functions. ESAIM Control Optim Calc Var, 4: 361-376. CR - Bokalo M, Skira I, Bokalo T. 2024. Strong nonlinear functional-differential variational inequalities: Problems without initial conditions. Front Appl Math Stat, 10: 54-61. 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On the stability of functional-differential inclusions with the use of invariantly differentiable Lyapunov functionals. Differ Equ, 43(8): 1079-1087. UR - https://doi.org/10.34248/bsengineering.1746300 L1 - https://dergipark.org.tr/tr/download/article-file/5070894 ER -