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Thank you x

How do I align all of my equations to the left hand side?

Thank you, thank you, thank you x

Hello all,
I am trying to get this array

\begin{equation}U = \left( \begin{array}{c}
\rho\\
\rho u\\
\rho v\end{array} \right),\end{equation}

into the values marked x in this array

\[ F^+(U) = \left\{ \begin{array}{ll}
x & \mbox{$x \geq 0$};\\
x & \mbox{$x \geq 0$};\\
-x & \mbox{$x < 0 ...

Thank you x

Hello all,

Can anybody help me display fractions in my matrix in display form as a pose to inline form

My code is

\begin{equation}H = \left( \begin{matrix}{}
0\\[10pt]
2\Omega(v-v_0)\rho+\frac{2}{\alpha r}\rho A \sin \hat{\eta}\\[10pt]
-\frac{\kappa^2}{2\Omega}(u-u_0)\rho\end{matrix} \right ...

You are a star! Thank you. While I've got your attention. I am using a piece of code

\defaultfontfeatures{Mapping=tex-text}
\setromanfont[Mapping=tex-text]{Fontin Sans}
\setsansfont[Scale=MatchLowercase,Mapping=tex-text]{Gill Sans}
\setmonofont[Scale=MatchLowercase]{Andale Mono}

where I can select ...

Dear LaTeX gurus,

I was wondering if anybody could help me change the color/thickness of a section underline.
I have used \usepackage{titlesec}

and have used the code

\titleformat{\section}{\Large\raggedright}{}{0em}{}[\titlerule]
%Tweak the top margin
\addtolength{\voffset}{-1.3cm}

How do I ...