Aydin, Mustafa2025-07-302025-07-3020250037-87122175-118810.5269/bspm.75315https://doi.org/10.5269/bspm.75315https://hdl.handle.net/20.500.14720/28063Relative controllability of linear and nonlinear fractional systems with time-variable delays in control variables for finite-dimensional spaces is considered. Sufficient and necessary circumstances for the controllability of a linear fractional system are offered. Employing Schauder's fixed point theorem, sufficient circumstances for the controllability of nonlinear fractional systems are presented.eninfo:eu-repo/semantics/closedAccessFractional Differential EquationsRelative ControllabilityControl DelayMittag-Leffler Matrix FunctionSchauder's Fixed-Point TheoremArticle43N/AQ2111WOS:001533101000001