Fitting a power-law correction to two noble-gas atoms recovers the LDA exchange functional's exponent within 0.3%, but with no held-out test the benchmark is more a consistency check than a prediction.
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How to Improve Functionals in Density Functional Theory? ---Formalism and Benchmark Calculation---
Fitting a power-law correction to two noble-gas atoms recovers the LDA exchange functional's exponent within 0.3%, but with no held-out test the benchmark is more a consistency check than a prediction.