Clear visibility strikes again
The authors extend some of the results of \textit{N. M. Stavrakas} [Proc. Am. Math. Soc. 34, 222-224 (1972; Zbl 0235.52004)] to the infinite dimensional case and prove several Krasnoselskij-type theorems. In their proofs the authors use extensively the notion of clear visibility introduced by N. Stavrakas.
scientific article; zbMATH DE number 62268