Generalized Gradient Approximation Made Simple
Physical Review Letters, 1996 · paper · Physics
Presents a simple derivation of a generalized gradient approximation for the exchange-correlation energy in density functional theory, with all parameters being fundamental constants. It claims improvements over the PW91 functional, including better uniform-gas response, correct scaling, and a smoother potential.
Checked: PDF from dft.uci.edu, fetched 5 Oct 2026. Page numbers are those of that PDF.
0 findings
None that passed a second check.
2 minor (typos and the like; most checked by the judge only)
Typo Page 1, right column, problem (6): "it descibes the linear response" — 'descibes' is a misspelling of 'describes'.
- p. 1 Right column, problem (6)
it descibes the
Judge's note: I checked the crop image of page 1, right column. The printed text reads "it descibes the", so the misspelling is in the PDF itself and is not an extraction artefact.
Second check: none (judge only)
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Typo In condition (c) the limit of ε_C^unif has the prefactor printed "(e²/a_o)" with a letter o, while a_0 (zero) is used elsewhere, including in ln(r_s/a_0) in the same expression.
- p. 2 Condition (c), limit of ε_C^unif
se2yaodf3fg lnsrsya0d 2 vg
Judge's note: On page 2 the subscript in the prefactor renders as 'o'. The text layer also distinguishes 'aod' from 'a0' in the same expression. This is a cosmetic notation inconsistency.
Second check: none (judge only)