Farahani, Moahmmad RezaValdes, Juan E. NapolesCancan, MuratJafari, Saeid2025-05-102025-05-1020230972-05022169-012X10.47974/JIM-16332-s2.0-85176461123https://doi.org/10.47974/JIM-1633https://hdl.handle.net/20.500.14720/9696Jafari, Saeid/0000-0001-5744-7354We obtain a general solution of the 2-variable quadratic functional equation zeta(y(1) + y(2), y(3) + y(4)) + zeta(y(1)-y(2), y(3)-y(4)) = 2 zeta(y(1), y(3)) + 2 zeta(y(2), y(4)) and discuss the stability of the above functional equation, while the quadratic form zeta(a, b) = alpha a(2) + beta ab + gamma c(2) is a solution of our functional equation.eninfo:eu-repo/semantics/closedAccessFuzzy Normed SpaceFixed PointFuzzy StabilityTau-NormQuadratic Functional EquationArticle266N/AQ213551365WOS:001086926600034