Viscosity Iteration Algorithm for $\varrho$-Strictly Pseudononspreading Mapping in Hilbert Space

In this paper, we discuss the strong convergence of the viscosity approximation method in Hilbert spaces, relatively to the computation of fixed points of operator in $\varrho$-strictly pseudononspreading. Under suitable conditions, some strong convergence theorems are proved. Our works improve previous results for nonspreading mappings.