Iranian Mathematical Society Journal of the Iranian Mathematical Society 2717-1612 6 1 2025 01 01 Boundedness of composition operators on $X^\Phi$ spaces 1 7 211542 10.30504/jims.2024.476597.1205 EN A. Bagheri Salec Department of Mathematics‎, ‎University of Qom‎, ‎Qom‎, ‎Iran. 0000-0002-4917-6125 S. M. Tabatabaie Department of Mathematics‎, ‎University of Qom‎, ‎Qom‎, ‎Iran. L'aszl'o Szekelyhidi Debrecen University‎, ‎Department of Mathematics‎, ‎Debrecen‎, ‎Hungary. 0000-0001-8078-6426 A. H. K. Alhusseini Department of Mathematics‎, ‎University of Qom‎, ‎Qom‎, ‎Iran. Journal Article 2024 09 02 In this paper‎, ‎we study composition operators on the space $X^\Phi$‎, ‎where $\Phi$ is a Young function and $X^\Phi$ is a generalized Orlicz space associated to a Banach function space $X$‎. We give some necessary and sufficient conditions for a composition operator to be bounded on $X^\Phi$‎. Banach function spaces Composition operator Generalized Orlicz spaces https://jims.ims.ir/article_211542_b9f9633614ab1ecc90edc6502626f745.pdf