8
C> \frac{\partial^2({\mu}{\rho}|{\nu}{\lambda})}{\partial X_x\partial X_y} = \int_{-\infty}^{\infty} \frac{\partial^2 g_{\mu}(X_{\mu},r_{1})g_{\rho}(X_{\rho},r_{1})\frac{1}{r_{12}}g_{\nu}(X_{\nu},r_{2})g_{\lambda}(X_{\lambda},r_{2})}{\partial X_x\partial X_y}dr_{1}dr_{2}
1
17
subroutine intdd_2e4c(brain, ish, jsh, ketin, ksh, lsh,
2
18
& lscr, scr, leri, eri, idatom)
6
22
* basic api routine to generate 4 center two electron