GYutsis: heuristic based calculation of general recoupling coefficients

Abstract
General angular momentum recoupling coefficients can be expressed as a summation formula over products of 6-j coefficients. Yutsis, Levinson and Vanagas developed graphical techniques for representing the general recoupling coefficient as a cubic graph and they describe a set of reduction rules allowing a stepwise generation of the corresponding summation formula. This paper is a follow up to [Van Dyck and Fack, Comput. Phys. Comm. 151 (2003) 353–368] where we described a heuristic algorithm ...

Title of program: GYutsis: VAN DYCK, FACK
Catalogue Id: ADRM_v2_0 [ADSA]

Nature of problem
A general recoupling coefficient for an arbitrary number of (integer or half-integer) angular momenta can be expressed as a formula consisting of products of 6-j coefficients summed over a certain number of variables . Such a formula can be generated using the program GYutsis (with a grap hical user front end ) or CycleCostAlgorithm (with a text-mode user fron t end).

Versions of this program held in the CPC repository in Mendeley Data
ADRM_v1_0; CycleCostAlgorithm, GYutsis; 10.1016/S0010-4655(02)00733-6
ADRM_v2_0; GYutsis: VAN DYCK, FACK; 10.1016/S0010-4655(03)00280-7

This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)