
\magnification = \magstep1


$$
B_{\lambda}(T) \quad = \quad 
 {    { 2 h c^2 / {\lambda}^5 } \over
      { e^{ hc/\lambda kT} - 1 }    }
$$


$$
L \quad = \quad 4 \pi R^2 \sigma T^4
$$

\bye 
