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need help I need to put these three equations in three lines covered by a big parenthesis on the right side with the tag (Tolman 1939)

$$KP=e^{-\lambda} \Big( \frac {\nu'}{r}+ \frac {1}{r^2}\Big)-\frac {1}{r^2}$$

$$ KP= e^{-\lambda} \Big(\frac {\nu ''}{2}-\frac {\lambda ' \nu '}{4} + \frac {(\nu')^2}{4} + \frac {\nu' -\lambda'}{2r}\Big)$$

 $$K \rho c^2= e^{-\lambda}\Big (\frac {\lambda '}{r}-\frac {1}{r^2}\Big) +\frac {1}{r^2}$$
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Comment aside: you should not use $$ … $$, which is plain TeX and can result in wrong vertical spacing. Use \[ … \] instead. – Bernard Aug 5 '14 at 10:05
up vote 4 down vote accepted

You can add a brace on just one side with a \left. on one side and an \right\} to add the brace on the right.

enter image description here




             KP &= e^{-\lambda} \Big( \frac {\nu'}{r}+ \frac {1}{r^2}\Big)-\frac {1}{r^2} \\
             KP &= e^{-\lambda} \Big(\frac {\nu ''}{2}-\frac {\lambda ' \nu '}{4} + \frac {(\nu')^2}{4} + \frac {\nu' -\lambda'}{2r}\Big) \\
     K \rho c^2 &= e^{-\lambda}\Big (\frac {\lambda '}{r}-\frac {1}{r^2}\Big) +\frac {1}{r^2}
\right\} \tag{Tolman 1939}
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A variant with a slighly simpler code, thanks to the empheq package (that loads mathtools, from the same author, and amsmath):



\begin{align*}[right = \empheqrbrace]
             KP &= e^{-\lambda} \Big( \frac {\nu'}{r}+ \frac {1}{r^2}\Big)-\frac {1}{r^2}  \\
             KP &= e^{-\lambda} \Big(\frac {\nu ''}{2}-\frac {\lambda ' \nu '}{4} + \frac {(\nu')^2}{4} + \frac {\nu' -\lambda'}{2r}\Big)  \tag{Tolman 1939}\\
     K \rho c^2 &= e^{-\lambda}\Big (\frac {\lambda '}{r}-\frac {1}{r^2}\Big) +\frac {1}{r^2}

enter image description here

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