Sandbox

$NSGAPA=(\frac{{\sum }^{D}GD{P}_R}{{\sum }^{D}PO{P}_r})-(\frac{{\sum }^{G}D{P}_r}{{\sum }^{L}PO{P}_r})$

$\frac{{\mathrm{d}}^{2}R}{{\mathrm{d}Q}^2}<\frac{{\mathrm{d}}^{2}C}{{\mathrm{d}Q}^2}$