BENAISSA RAHAL HaneneBELLATAR ZOKHA2026-09-202026-09-202026https://dspace.univ-temouchent.edu.dz/handle/123456789/7655In this thesis, we analyzed boundary value problems related to second-order impulsive differential equations and impulsive fractional differential equations. By applying the Banach contraction principle as well as the two fixed point theorems of Leray-Schauder, we established existence and uniqueness results for solutions under suitable hypotheses. This work confirms the importance of fixed point methods in the study of impulsive differential systems.frImpulsive differential equationsfractional differential equationsboundary value problemsfixed point theoremsBanach contraction principleLeray-Schauder theoremsexistenceuniqueness.Thesis