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LDA is the most simple approximation for this functional, it is ''local'' in the sense that the electron exchange and correlation energy at any point of the space is a function of the electron density at that point in space only.
The LDA functional is derived from a model assuming that the per-electron exchange-correlation energy at every point in space is equal to the per-electron exchange-correlation energy of a non-interacting homogeneous electron gas. This model is sometimes known as the [[Jellium]] model.
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[[Category:Density functional theory]]
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