Abstract
In this paper, we introduce octadecic functional equation. Moreover, we prove the stability of the octadecic functional equation in multi-normed spaces by using the fixed point method.
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Nazarianpoor, M., Rassias, J.M. & Sadeghi, G. Stability and nonstability of octadecic functional equation in multi-normed spaces. Arab. J. Math. 7, 219–228 (2018). https://doi.org/10.1007/s40065-017-0186-0
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DOI: https://doi.org/10.1007/s40065-017-0186-0