System of Additive Functional Equations in Banach Algebras MEHDI DEHGHANIAN Sirjan University of Technology CHOONKIL PARK (  baak@hanyang.ac.kr ) Hanyang University YAMIN SAYYARI Sirjan University of Technology Research Article Keywords: additive mappin, g-derivation, ｦxed point method, Hyers-Ulam stability, system of functional equations Posted Date: August 3rd, 2022 DOI: https://doi.org/10.21203/rs.3.rs-1909082/v1 License:   This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License