The following compiles fine, but outputs a pdf with a line too long.
\documentclass{article}
\usepackage{amsmath}
\def\group#1{\left ( #1 \right )}
\begin{document}
$$
%\begin{split}
\group{\neg (v_1 = v_2) \land \neg (v_1 = v_3) \land ... \land \neg(v_1 = v_n)}
\land \group{\neg (v_2 = v_3) \land \neg (v_2 = v_4) \land ... \land \neg(v_2 = v_n)}
\land ... \land \group{\neg (v_{n-2} = v_{n-1}) \land \neg (v_{n-2} = v_n)} \land \group{\neg (v_{n-1} = v_n)}
%\end{split}
$$
\end{document}
On the other hand, I get an error when I add the split environment.
\documentclass{article}
\usepackage{amsmath}
\def\group#1{\left ( #1 \right )}
\begin{document}
$$
\begin{split}
\group{\neg (v_1 = v_2) \land \neg (v_1 = v_3) \land ... \land \neg(v_1 = v_n)}
\land \group{\neg (v_2 = v_3) \land \neg (v_2 = v_4) \land ... \land \neg(v_2 = v_n)}
\land ... \land \group{\neg (v_{n-2} = v_{n-1}) \land \neg (v_{n-2} = v_n)} \land \group{\neg (v_{n-1} = v_n)}
\end{split}
$$
\end{document}
Error message:
! Missing } inserted.
<inserted text>
}
l.13 $
$
$$
is not supposed to be used withamsmath
(or... at all, actually). The documentation even says as much. Try using\[ .. \]
instead....
should be\dotsb
because you're usingamsmath
and they are dots between binary operators.