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C..20 G96: Gill's 1996 Gradient Corrected Exchange Functional

\begin{dmath}
\alpha=-3/8\,\sqrt [3]{3}{4}^{2/3}\sqrt [3]{{\pi }^{-1}}
,\end{dmath}

\begin{dmath}
g= \left( \rho \left( s \right) \right) ^{4/3} \left( \alpha-{\frac {1
}{137}}\, \left( \chi \left( s \right) \right) ^{3/2} \right)
,\end{dmath}

\begin{dmath}
G= \left( \rho \left( s \right) \right) ^{4/3} \left( \alpha-{\frac {1
}{137}}\, \left( \chi \left( s \right) \right) ^{3/2} \right)
.\end{dmath}



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