PREC

PREC = 0 

Default: PREC	= 2	hallo
	= 1	byebye
	= 2	if ICHARG=11

The precision tag

Intro

An equation

$\frac{e}{\pi}=2y$

or an equation array

and set some tags into your INCAR file

PREC = A
GGA  = PE

And another section

and an array of equations

An eqnarray

$\begin{align} \frac{e}{\pi} & =\int_\Omega \psi (\mathbf{r}) d\mathbf{r} \\ a & = b \\ \end{align}$

And again

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