On the approximation-solvability of equations involving 𝐴-proper and pseudo-𝐴-proper mappings

Abstract

However, the following example from [116] shows that a sum of two y4-proper maps need not be ^4-proper. EXAMPLE Lib. Let H be a Hubert space with a complete orthonormal basis {<,}, X n =[<f) l9 , c/) n ], P n the orthogonal projection of H onto W. V. PETRYSHYN