Jac ladder

[StijnVanVooren]

Jacobs ladder is a sytstemic approach to approximating the exchange correlation functional. each step has is a better approximation. It starts with LDA, which takes into account only the local electron density and approximates as local gelium. the second step is GGA, now also taking into account the gradient of the electron density. then there are some other steps with increased accuracy. meta-GGA, hybrid SIC and RPA-like. Each step in the ladder uses the ingredients of the steps below and thus builds on it, or in other words, each step introduces a new ingredient, and increases the accuracy of the approx.

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