Functional Operators. Volume I: Measures and Integrals. Volume II: The Geometry of Orthogonal Spaces

First editions. Two volumes. Tall octavos. 261; 107pp. Original printed orange wrappers. Some sunning at the edges of the wrappers, and some faint spotting and dampstains at the spines, a very good, uniform set. Arthur S. Wightman's copies with his ownership Signature ("A.S. Wightman") on the front cover of each volume (one dated in 1951). Von Neumann was a pioneer of the application of operator theory to quantum mechanics, in the development of functional analysis, and a principal member of the Manhattan Project and the Institute for Advanced Study in Princeton. Wightman was one of the founders of the axiomatic approach to quantum field theory, and originated the set of Wightman axioms. His work, including such titles as *PCT, Spin and Statistics and All That*, frequently cites the work of von Neumann. Although we wouldn't claim to understand the writings of either mathematician, we know an excellent association when we see one.