Abstract
In statistical mechanics the integration of Liouville’s equation over N-q particle variables leads to a well known hierarchy of equations for reduced statistical distributions. In essence, the same pattern of thought is behind the Contracted Schrödinger Equation (CSE), which has been obtained independently by Cho [1] in 1962 as well as by Nakatsuji [2], and Cohen and Frishberg [3] in 1976. Nakatsuji named his integro-differential equation density equation, whereas Cohen and Frishberg called theirs hierarchy equations because the p-electron equation was coupled to its (p+1)- and (p+2)- counterparts. The initial interest raised by these results [4–9] subsided after some time because, due to their hierarchical structure, these equations were undetermined [10].
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Valdemoro, C., Tel, L.M., Pérez-Romero, E. (2000). Critical Questions Concerning Iterative Solution of the Contracted Schrödinger Equation. In: Cioslowski, J. (eds) Many-Electron Densities and Reduced Density Matrices. Mathematical and Computational Chemistry. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4211-7_6
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