In a recent Letter, Holas introduced nth-order generalizations of the McWeeny canonical purification scheme, hoping that these might be useful in linear-scaling electronic structure theory methods that rely on purification of density matrices. In this comment we show that for theories that use purification to guide unconstrained optimizations, the generalizations offer no advantage. (C) 2002 Elsevier Science B.V. All rights reserved.
|Article number||PII S0009-2614(02)00160-4|
|Number of pages||2|
|Journal||Chemical Physics Letters|
|Publication status||Published - 18 Mar 2002|