# horizontal alignment of equations across multiple lines

I need the following to line up so that the first line (integral) is on one line on the left at the top, then the following lines are indented and aligned to each other, but also so the 2 sets of conditions (lines starting \left[\alpha>0,... and \left[\Real\mu...) will align to be flush with the right of the page. How do I do this?

Thanks

\begin{document}

\begin{multline}
\int_0^\infty e^{-\alpha x}\, Y_\nu \left(\beta x\right)x^{\mu - 1}\,dx\\
= \cot v\pi\frac{\left(\frac{\beta}{2}\right)^{\nu}\Gamma\left(\nu+\mu\right)}{\sqrt{\left(\alpha^{2}+\beta^{2}\right)^{\nu+\mu}}\Gamma\left(\nu+1\right)}F\left(\frac{\nu+\mu}{2},\frac{\nu-\mu+1}{2};\nu+1;\frac{\beta^{2}}{\alpha^{2}+\beta^{2}}\right)\\
= \mathrm{cosec}\, \nu\pi\frac{\left(\frac{\beta}{2}\right)^{-\nu}\Gamma\left(\mu-v\right)}{\sqrt{\left(\alpha ^{2}+\beta^{2}\right)^{\mu-\nu}}\Gamma\left(1-\nu\right)}F\left(\frac{\mu-\nu}{2},\frac{1-\nu-\mu}{2};1-\nu;\frac{\beta^{2}}{\alpha^{2}+\beta^{2}}\right)\\
\left[\Real \mu \geq\lvert \Real \nu\rvert,\quad\Real\left(\alpha\pm \textit{i}\beta\right)>0\right]\\
=-\frac{2}{\pi}\Gamma\left(\nu+\mu\right)\left(\beta^{2}+\alpha^{2}\right)^{-\frac{1}{2}\mu} Q_{\mu-1}^{-\nu}\left[\alpha\left(\alpha^{2}+\beta^{2}\right)^ {-\frac{1}{2}}\right]\\
\end{multline}

\end{document}

• please fix your example so people can see the issue, I had to guess a preamble and presumably I guessed wrong ! Undefined control sequence. <argument> ...+\beta ^{2}}\right )\\ \left [\Real  It's far better if the example is complete, starting \documentclass... – David Carlisle Oct 18 '16 at 20:46
• Please state how the \Real macro is defined. – Mico Oct 18 '16 at 21:00

Like this?

I suppose that \Real means \Re ... The MWE for above equations is

\documentclass{article}
\usepackage{mathtools}
\DeclareMathOperator{\cosec}{cosec}

\begin{document}

\begin{align}
\MoveEqLeft
\int_0^\infty e^{-\alpha x}\, Y_\nu \left(\beta x\right)x^{\mu - 1}\,dx
\notag  \\
& = \cot v\pi\frac{\left(\frac{\beta}{2}\right)^{\nu}
\Gamma\left(\nu+\mu\right)}{\sqrt{\left(\alpha^{2}+\beta^{2}\right)^{\nu+\mu}}
\Gamma\left(\nu+1\right)}
F\left(\frac{\nu+\mu}{2},\frac{\nu-\mu+1}{2};\nu+1;\frac{\beta^{2}}{\alpha^{2}+\beta^{2}}\right)
\notag  \\
& = \cosec\, \nu\pi\frac{\left(\frac{\beta}{2}\right)^{-\nu}
\Gamma\left(\mu-v\right)}{\sqrt{\left(\alpha ^{2}+\beta^{2}\right)^{\mu-\nu}}\Gamma\left(1-\nu\right)}
F\left(\frac{\mu-\nu}{2},\frac{1-\nu-\mu}{2};1-\nu;\frac{\beta^{2}}{\alpha^{2}+\beta^{2}}\right)
\notag  \\
\intertext{\raggedleft
$\left[\Re \mu \geq\lvert \Re \nu\rvert, \quad\Re\left(\alpha\pm \textit{i}\beta\right)>0\right]$}
& =-\frac{2}{\pi}\Gamma\left(\nu+\mu\right)\left(\beta^{2}+\alpha^{2}\right)^{-\frac{1}{2}\mu}
Q_{\mu-1}^{-\nu}\left[\alpha\left(\alpha^{2}+\beta^{2}\right)^ {-\frac{1}{2}}\right]
\intertext{\raggedleft
$\left[\alpha>0,\quad\beta>0,\quad\Re \mu>\lvert\Re \nu\rvert\right]$}
\notag
\end{align}

\end{document}


You may want to use a combination of equation and split environments. (I wouldn't shoving the two condition lines all the way to the right.)

\documentclass{article}
\usepackage{amsmath,amsfonts}
\DeclareMathOperator{\cosec}{cosec}
\newcommand\Real{\mathfrak{R}} % is this correct?!
\usepackage{mleftright}\mleftright
\begin{document}

$$\begin{split} &\int_0^\infty e^{-\alpha x}\, Y_\nu (x)x^{\mu - 1}\,dx\\ &= \cot \nu\pi\frac{\bigl(\frac{\beta}{2}\bigr)^{\nu}\,\Gamma(\nu+\mu)}{\sqrt{(\alpha^2+\beta^2{)}^{\nu+\mu}}\,\Gamma(\nu+1)} F\left(\frac{\nu+\mu}{2},\frac{\nu-\mu+1}{2};\nu+1;\frac{\beta^2}{\alpha^2+\beta^2}\right)\\ &= \cosec \nu\pi\frac{\bigl(\frac{\beta}{2}\bigr)^{-\nu}\,\Gamma(\mu-v)}{\sqrt{(\alpha^2+\beta^2{)}^{\mu-\nu}}\,\Gamma(1-\nu)} F\left(\frac{\mu-\nu}{2},\frac{1-\nu-\mu}{2};1-\nu;\frac{\beta^2}{\alpha^2+\beta^2}\right)\\[1ex] &\qquad\qquad\bigl[\Real\mu\geq\lvert \Real \nu\rvert,\ \Real(\alpha\pm i\beta)>0\bigr]\\[1ex] &=-\frac{2}{\pi} \Gamma(\nu+\mu)(\beta^2+\alpha^2{)}^{-(1/2)\mu}\, Q_{\mu-1}^{-\nu} \bigl[\alpha(\alpha^2+\beta^2{)}^{-1/2}\,\bigr]\\[1ex] &\qquad\qquad\bigl[\alpha>0,\ \beta>0,\ \Real\mu>\lvert\Real \nu\rvert\bigr] \end{split}$$

\end{document}

• Till to now I wasn't aware of interesting mleftright package. – Zarko Oct 18 '16 at 21:37