How to force left alignment in an aligned array of formulas?

Question

So I try

\begin{equation}\label{eq2}
\left.\begin{aligned}
\Phi (z)=-\frac{{\rm 1}}{{\rm 2\pi}{i}} \int _{-\infty }^{+\infty }\frac{N-iT}{x-z} dx ,\\  {\rm \Psi }(z)=-\frac{{\rm 1}}{{\rm 2\pi }{i}} \int _{-\infty }^{+\infty }\frac{N+iT}{x-z} dx-{\rm \Phi }(z)-z{\rm \Phi }^{'} (z),
\end{aligned}\right.
\end{equation}

But it renderes like

.

How to force it to be alligned left?

Answer 1

You forgot the alignment & character:

\documentclass{article}
\usepackage{amsmath}

\begin{document}
\begin{equation}\label{eq2}
\left.\begin{aligned}
\Phi (z) &=-\frac{{\rm 1}}{{\rm 2\pi}{i}} \int _{-\infty }^{+\infty }\frac{N-iT}{x-z} dx ,\\  {\rm \Psi }(z)&=-\frac{{\rm 1}}{{\rm 2\pi }{i}} \int _{-\infty }^{+\infty }\frac{N+iT}{x-z} dx-{\rm \Phi }(z)-z{\rm \Phi }^{'} (z),
\end{aligned}\right.
\end{equation}
\end{document}