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Projections on convex sets in Hilbert space and spectral theory. I: Projections on convex sets. II: Spectral theory. (English) Zbl 0281.47043
Contrib. nonlin. functional Analysis, Proc. Sympos. Univ. Wisconsin, Madison 1971, 237-424 (1971).

47H99 Nonlinear operators and their properties
52B45 Dissections and valuations (Hilbert’s third problem, etc.)
47H05 Monotone operators and generalizations
47B40 Spectral operators, decomposable operators, well-bounded operators, etc.