In this paper, we establish the Hyers-Ulam stability of the orthogonally quintic functional equation in Multi-Banach Spaces.

In this paper, we prove the Stability of Decic Functional Equation in Multi-Banach Spaces by using fixed point technique.

In this paper we estabilish the Stability of Cubic-Quartic Functional Equations in Multi-Fuzzy Banach Spaces. g(2a + b) + g(2a − b) = 3g(a + b) + g(−a − b) + 3g(a − b) +g(b − a) + 18g(a) + 6g(−a) − 3g(b) − 3g(−b)

In this Paper, we establish the General solution and stability of a new type additive functional equation is of the form f (2x + 5y) − f (x + 4y) = f (x) + f (y) in Multi-Banach Space in the sense of Hyers-Ulam.

In this paper, we establish the Hyers-Ulam stability of the following Orthogonally Additive-Quadratic functional equation in Multi-Banach Spaces. ζ(2i + j) − ζ(i + 2j) − ζ(i + j) − ζ(j − i) − ζ(i) + ζ(j) + ζ(2j) = 0 with i⊥j where, ⊥ is orthogonality in the sense of Ratz.