\magnification=\magstep1

$$
R \quad = \quad {{2 G M}\over{c^2}}
$$

$$
R \quad \simeq \quad {3000 \rm\ meters} \ \left( {{M}\over{M_\odot}} \right) 
$$

$$
{\rm potential\ energy\ lost\ } \quad = \quad {{G M m}\over{R}}
$$

\bye
