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Pople diagram : ウィキペディア英語版
Pople diagram

A Pople diagram or Pople's Diagram is a diagram which describes the relationship between various calculation methods. It was initially introduced in January 1965 by Sir John Anthony Pople, (31 October 1925 – 15 March 2004), during the ''Symposium of Atomic and Molecular Quantum Theory'' in Florida. The Pople Diagram can be either 2-dimension or 3-dimensional, with the axes representing Ab initio quantum chemistry methods, Basis sets used in computational chemistry and treatment of relativity. The diagram attempts to balance calculations by giving all aspects of a computation equal weight.
== History ==

John Pople first introduced the Pople Diagram during the Symposium on Atomic and Molecular Quantum Theory held on Sanibel Island, Florida, in January 1965. He called it a "hyperbola of quantum chemistry", which illustrates the inverse relationship between the sophistication of a calculational method and the number of electrons in a molecule that can be studied by that method.〔 Alternative (reverse) arrangement of the vertical axis or interchange of the two axes are also possible.
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