Sum rules are derived for expressions of the form Σkωkna|Akn|2; |a|=0, 1, ⋯. Application of the sum rules are given for various forms of A.
DOI:https://doi.org/10.1103/PhysRev.157.1220
©1967 American Physical Society
R. Jackiw*
Vol. 157, Iss. 5 — May 1967
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