*~0~ and *C*~0~ are related through the equation$$\documentclass[00pt]{minimal}                 \usepackage{amsmath}                 \usepackage{wasysym}                  \usepackage{amsfonts}                  \usepackage{amssymb}                  \usepackage{amsbsy}                 \usepackage{mathrsfs}                 \usepackage{upgreek}                 \setlength{\oddsidemargin}{-00pt}                 \begin{document}$$ D_{R} \pi_{C} (C_{0} ) - \frac{{D_{B} }}{{\pi_{C} (C_{0} )}}R_{0} = 0