"Zum mehrkorperproblem der quantentheorie."

In:: Zeitschrift fur physik, 45 (1927)., 1927. 8vo. pp. 751-765. Navy cloth, gilt stamped spine; spine lightly freckled. Ex library Carnegie Institution of Washington Mount Wilson Observatory with call number gilt stamped on spine and library blind-stamp on front free end paper. Clean copy, handsomely bound; covers lightly freckled, else fine. RARE. FIRST EDITION of the Jordan-Klein matrices. This paper contributed to the demonstration of the close connection between quantum fields and quantum statistics. It was known that second quantization guarantees that photons obey Bose-Einstein statistics; but what of other particles which obey Bose-Einstein statistics? Jordan and Klein showed that second quantization is not confined to free particles only. One can quantize just as well the non-relativistic Shrodinger equation. "In honor of these contributions the matrices [they introduced] have been named Jordan-Klein matrices." Pais, Inward bound, pp. 338-339.