\magnification=\magstep2

$$
\Delta E \Delta t \simeq {\hbar} 
$$

$$
{{\Delta \lambda}\over{\lambda_0}} = \sqrt{ {{1 - (v/c)}\over{1 + (v/c)}} }
$$

$$
{{\Delta \lambda}\over{\lambda_0}} \simeq {{v}\over{c}}
$$


\bye
