Abstract
Dyson's systematic approach to the reduction of the Heisenberg -Matrix into a sum of "graph" terms can be simplified. A notation is introduced and an algebraic theorem is proved, which allow one to handle the reduction problem quite easily and in the same manner for any type of field.
- Received 17 April 1950
DOI:https://doi.org/10.1103/PhysRev.80.268
©1950 American Physical Society