Jacob’s ladder

[Henry Ezeaku]

In the context of density functional theory (DFT), Jacob’s ladder is a conceptual framework that classifies various approximations for exchange-correlation functionals according to their level of sophistication and accuracy. The ladder analogy was introduced by John Perdew to categorize the functionals from the simplest to the most complex, reflecting how they build upon each other to achieve higher levels of precision in electronic structure calculations.

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