# name
Variational localized-site cluster expansions. II. Trees and near trees

# metadata.dc.description.abstract[].value
Cluster expanded wavefunctions involving localized‐site states and only pair excitations between nearest neighbor sites are considered. In the case that the bonds connecting these nearest neighbor sites form a tree graph (without rings), exact matrix element formulas are obtained in terms of the inverse of a modified type of topological matrix associated with this tree graph. The treatment of some near‐tree cases, without any touching rings, is also discussed.

# metadata.dc.rights[].value
(c) American Institute of Physics (AIP), 1976

# metadata.dc.source[].value
Articles publicats en revistes (Física de la Matèria Condensada)

# metadata.dc.title[].value
Variational localized-site cluster expansions. II. Trees and near trees