Extensions of positive projections and averaging operators. (English) Zbl 0727.47021

The authors prove extension theorems for positive projections in order complete Riesz spaces and Archimedean semiprime f-algebras thereby extending results of G. L. Seever [Pac. J. Math. 17, 159-166 (1966; Zbl 0137.10002)] and C. B. Huijsmans and B. de Pagter [J. Math. Anal. Appl. 113, 163-184 (1986; Zbl 0604.47024)].


47B65 Positive linear operators and order-bounded operators
47B60 Linear operators on ordered spaces
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