BOUSBAA, Racha2020-10-212020-10-212020http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/20008Recently, generalized Orlicz spaces has become part of the mainstream research fields in contemporary functional analysis. so, In this memory, we study some definitions and basic properties of Φ-function and we use them to study some properties of generalized Orlicz spaces (also known as Musielak-Orlicz spaces) as convergence, completeness, separability, uniform convexity, reflexivity and density of smooth functions.enΦ-function, Variable exponent Lebesgue spaces Lp(·), Orlicz spaces, Generalized Orlicz spacesThesis