The Feynman diagrams of the Green's function expansion of fermions
interacting with a non-relativistic 2-body interaction are displayed in first,
second and third order of the interaction as 2, 10 and 74 diagrams,
respectively. A name convention for the diagrams is proposed and then used to
tabulate the 706 diagrams of fourth order. The Hartree-Fock approximation
summons up 2, 8, 40 and 224 of them, respectively.Comment: 12 pages, 13 figures, 16 tables. Index typo in Sect III corrected.
More lines in Table XV. Three more references. Expanded Summar