# A program to evaluate closed diagrams algebraically for angular momentum coupled product operators

## Description

Title of program: CONTRACTION-JT-RECOUPLING Catalogue Id: AAAM_v1_0 Nature of problem The many particle trace of a product operator, expressed in terms of angular-momentum coupled spherical tensor creation and annihilation operators, can be evaluated as the sum of the different ways or diagrams to contract all the single particle operators. In the coupled representation, the process of contraction involves recouplings of angular momenta and this can be tedious. The program is constructed to perform algebraically the contractions and the associated angular momentum recouplings. Th ... Versions of this program held in the CPC repository in Mendeley Data AAAM_v1_0; CONTRACTION-JT-RECOUPLING; 10.1016/0010-4655(80)90002-8 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)