Bulletin of the
Korean Mathematical Society BKMS

By applying ideas from [M. S. Moslehian, et al., Norms of operators in $X_{\lambda}$ spaces, Appl. Math. Lett. (2007), doi:10.1016/j.aml.2006. 11.009], we investigate the norm of the cubic operator on the function space $X_\lambda$.

Keywords: cubic functional equation, cubic operator, operator norm, $X_\lambda$ space

MSC numbers: Primary 47A30, 47B38; Secondary 39B52