$$
{\rm p-p\ chain:\ energy\ generation \ } \propto \thinspace T^{4}
$$

$$
{\rm CNO\ cycle:\ energy\ generation \ } \propto \thinspace T^{20}
$$

$$
{\rm E} = \rm m c^2
$$

$$
{ {\rm lifetime} \over {\rm solar \ lifetime}} \quad = \quad
   {\left( {{ \rm mass} \over {\rm solar \ mass } } \right)} ^{-2.5}
$$

\bye
