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In this paper, the authors obtain the generalized Ulam Hyers stability of a 2 variable AC mixed type functional equation f(2x+ y, 2z + w) − f(2x− y, 2z − w) = 4[f(x+ y, z + w) − f(x− y, z − w)] − 6f(y,w) in Felbin’s type spaces using fixed point method. Mathematics Subject Classification: 39B52, 32B72, 32B82

Ulam-Hyers stability of a 2-variable AC-mixed type functional equation in Felbin's type spaces: fixed point method