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Optimality in interval fractional programming problems using d-invexity | ||
| Iranian Journal of Fuzzy Systems | ||
| دوره 22، شماره 1، فروردین و اردیبهشت 2025، صفحه 71-91 اصل مقاله (783.62 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22111/ijfs.2025.48874.8615 | ||
| نویسندگان | ||
| Nisha Pokharna* 1؛ Indira P. Tripathi2 | ||
| 1Department of Mathematics, Sardar Vallabhbhai National Institute of Technology | ||
| 2Department of Mathematics, Sardar Vallabhbhai National Institute of Technology, Surat | ||
| چکیده | ||
| In this paper, an interval fractional optimization problem with directionally differentiable functions is considered, and the d-invexity concept is introduced for interval-valued functions. Slater's constraint qualification and pre-invex directional derivative assumption are used to establish the necessary optimality conditions. Further, sufficient optimality conditions are derived under the d-invexity assumption, considering the LU-solution concept. As an application of interval fractional problems, a portfolio optimization problem with uncertain return and risk parameters subject to interval liquidity constraints is considered, and an optimal solution is obtained using the results developed in this paper. Also, the portfolio optimization problem is solved using the proposed global criteria method for interval optimization problems and two methods available in the literature. Moreover, to check the efficiency of the proposed method, a comparison between different methods is presented. Throughout the paper, non-trivial examples are presented at appropriate places to provide a better understanding of the results developed. | ||
| کلیدواژهها | ||
| Interval fractional problem؛ d-invexity؛ pre-invexity؛ optimality conditions؛ portfolio optimization | ||
| مراجع | ||
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