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So I try

\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),

But it renderes like


How to force it to be alligned left?

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Not sure why you have the \left., \right.? – Peter Grill Apr 9 '12 at 17:53
up vote 5 down vote accepted

You forgot the alignment & character:

enter image description here


\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),
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