\magnification=\magstep2

$$
{\vec{a}} \thinspace \equiv \thinspace { {  {d \vec{v}}\over{dt} } }
$$


$$
{\vec{v}} \thinspace \equiv \thinspace { \int { \vec{a}} \thinspace  {dt} } 
$$


$$
    \Omega_{\rm b}
$$

\medskip 

$$
    \Omega_{\rm dm}
$$

\medskip

$$
    \Omega_{\rm M} = \Omega_{\rm b} + \Omega_{\rm dm}
$$

\medskip

$$
    \Omega_{\rm \Lambda}
$$

$$
   \Lambda
$$


\bye
