Editing Kirkwood superposition approximation

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The '''Kirkwood superposition approximation''' takes its name from [[John G. Kirkwood]]  (see Eq. 40 Ref. 1, Eq. 5.6 Ref. 2)
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[[John G. Kirkwood]]  (Eq. 40 Ref. 1, Eq. 5.6 Ref. 2)
  
  
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It appears that this was used as a basis of a closure for the
 
It appears that this was used as a basis of a closure for the
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Kirkwood [[integral equations |integral equation]] (Ref. 1) and the Yvon, and Born-Green
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Kirkwood integral equation (Ref. 1) and the Yvon, and Born-Green
 
(Ref. 2) until the work of Morita and Hiroike (Ref. 3).
 
(Ref. 2) until the work of Morita and Hiroike (Ref. 3).
 
It was pointed out in Ref.s 4 and 5, that there is an inconsistency between
 
It was pointed out in Ref.s 4 and 5, that there is an inconsistency between
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the [[Pressure equation |pressure]] and the [[compressibility equation]] if this superposition approximation is used to generate <math>g(r)</math>.
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the pressure and the compressibility equation if this superposition approximation is used to generate <math>g(r)</math>.
 
This approximation is rigorously correct for one-dimensional systems, and is only true in three-dimensions in the limit of zero density.  
 
This approximation is rigorously correct for one-dimensional systems, and is only true in three-dimensions in the limit of zero density.  
 
It has recently been shown that the Kirkwood superposition approximation precludes the existence of a critical point (Ref. 6).
 
It has recently been shown that the Kirkwood superposition approximation precludes the existence of a critical point (Ref. 6).

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