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Due to the fact that only static property results are determined, it is possible, but certainly not recommended, to calculate beta values from an energy expansion (eq. 1)  E=E(0)-¦ÌiFi-1/2¦ÁijFiFj-1/6¦ÂijkFiFjFk-1/24¦ÃijklFiFjFkFl-¡­¡­
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this is known to be numerically sensitive and computationlly inefficient . with the program used by the authors, there are analytic derivative techniques available. why are these not employed?
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zhou2009(½ð±Ò+3): 2010-10-12 08:18:13
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