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I have a problem with the different size of parenthesis with multiline (see image). Actually i don't care about the different size of the square parenthesis on M and \bar{M} but I really care about the round square one! I want the same size (and I don't wanna avoid \left and \right since I need the last parenthesis as big as the integral!). Some help?

enter image description here

Code:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{multline}
\left\lbrace q\left( t\right) \right\rbrace = \left[ \Phi \right] \left( \left[ C\left( t\right) \right] \left[ \bar{M}\right] \left[ \Phi\right]^{\textrm{T}}  \left[ M\right] \left\lbrace q_{0} \right\rbrace + \left[ \Omega\right]^{-1} \left[ S\left( t\right) \right] \left[ \bar{M}\right] \left[ \Phi\right]^{\textrm{T}}  \left[ M\right] \left\lbrace \dot{q}_{0} \right\rbrace + \right. \\
\left. \left[ \bar{M}\right] \left[ \Omega\right]^{-1}  \intop_{0}^{t}  \left[ S\left( t-\tau \right) \right] \left[ \Phi\right]^{\textrm{T}}  \left\lbrace e \left( \tau\right) \right\rbrace d\tau  \right) .
\end{multline}
\end{document}
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marked as duplicate by Werner, Peter Jansson, Jubobs, Paul Stanley, Benedikt Bauer Mar 31 at 21:38

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Welcome to TeX.SX! Please make your code compilable (if possible), or at least complete it with \documentclass{...}, the required \usepackage's, \begin{document}, and \end{document}. That may seem tedious to you, but think of the extra work it represents for TeX.SX users willing to give you a hand. Help them help you: remove that one hurdle between you and a solution to your problem. –  Adam Liter Mar 31 at 16:55
    
ok, done now. sorry –  Simone Mezzapesa Mar 31 at 17:29
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2 Answers 2

up vote 12 down vote accepted

Don't use

\left(    \right.  \\
\left.   \right)

as that doesn't match the sizes, use

\bigl(     \\
        \bigr)

or some other size such as Bigg

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You can place a \vphantom of the integral in the first line, as in

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{multline}
\left\lbrace q\left( t\right) \right\rbrace = \left[ \Phi \right] \left( \left[ C\left( t\right) \right] \left[ \bar{M}\right] \left[ \Phi\right]^{\textrm{T}}  \left[ M\right] \left\lbrace q_{0} \right\rbrace + \left[ \Omega\right]^{-1} \left[ S\left( t\right) \right] \left[ \bar{M}\right] \left[ \Phi\right]^{\textrm{T}}  \left[ M\right] \left\lbrace \dot{q}_{0} \right\rbrace + 
\vphantom{\intop_{0}^{t} }\right. \\
\left. \left[ \bar{M}\right] \left[ \Omega\right]^{-1}  \intop_{0}^{t}  \left[ S\left( t-\tau \right) \right] \left[ \Phi\right]^{\textrm{T}}  \left\lbrace e \left( \tau\right) \right\rbrace d\tau  \right) .
\end{multline}
\end{document}
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