Math & Science ⇒ breqn | Too narrow Column in "dmath" Environment

[dmitry]

Hi,

I have just tried the breqn package to enable line breaks in the following formula ('cause this is the only option to get line breaks between \left( and \right)):

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\begin{dmath*}
\F^{(\tau)}(\uu)=\left(\xm^{(1)},\dots,\xm^{(\tau-1)},\x^{(\tau)}:=f(\xm^{(\tau-1)}, \u^{(\tau)}),\x^{(\tau+1)}:=f(\x^{(\tau)},\u^{(\tau+1)}),
\x^{(\tau+2)}:=f(\x^{(\tau+1)},\u^{(\tau+2)}), \dots\right).
\end{dmath*}

But this results in squeezing the formula into very tiny column, about 1/3 of the column width. Could you suggest what parameter has to be changed in order to make the column width for this formula the same as for the rest of text and regular displayed math formulas?

Here is the preamble:

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\documentclass[12pt]{article}
\linespread{1.5}\selectfont
\usepackage[english]{babel}
\usepackage{amsmath,amssymb}
\usepackage{breqn}
\usepackage[usenames,dvipsnames]{xcolor} %D%
\newcommand{\f}{f} 
\newcommand{\F}{F}
\renewcommand{\t}{t}
\newcommand{\T}{T} 
\newcommand{\x}{\mathbf{x}}
\newcommand{\xm}{\breve{\x}}
\renewcommand{\u}{\mathbf{u}}
\newcommand{\y}{\mathbf{y}}
\newcommand{\X}{X}
\newcommand{\U}{U}
\newcommand{\N}{\mathrm{N}}
\newcommand{\nat}{\mathbb{N}}
\newcommand{\xx}{\bar{x}}
\newcommand{\uu}{\bar{u}}
\newcommand{\XX}{\mathcal\X}
\newcommand{\UU}{\mathcal\U}

[justdeath]

Hi, you should use the align environment:

minimal working example

Code: Select all

\documentclass{article}
\usepackage{amsmath}
\newcommand{\f}{f}
\newcommand{\F}{F}
\renewcommand{\t}{t}
\newcommand{\T}{T}
\newcommand{\x}{\mathbf{x}}
\newcommand{\xm}{\breve{\x}}
\renewcommand{\u}{\mathbf{u}}
\newcommand{\y}{\mathbf{y}}
\newcommand{\X}{X}
\newcommand{\U}{U}
\newcommand{\N}{\mathrm{N}}
\newcommand{\nat}{\mathbb{N}}
\newcommand{\xx}{\bar{x}}
\newcommand{\uu}{\bar{u}}
\newcommand{\XX}{\mathcal\X}
\newcommand{\UU}{\mathcal\U}

\begin{document}

\begin{align*}
\F^{(\tau)}(\uu)=&\left(\xm^{(1)},\dots,\xm^{(\tau-1)},\x^{(\tau)}:=f(\xm^{(\tau-1)}, \u^{(\tau)}), \right.\\
&\left.\x^{(\tau+1)}:=f(\x^{(\tau)},\u^{(\tau+1)}),
\x^{(\tau+2)}:=f(\x^{(\tau+1)},\u^{(\tau+2)}), \dots\right).
\end{align*}

\end{document}

[/MWE]

Also, when you only need one bracket, you can type the other bracket with a dot:

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\left( x^2 \right.
\left. y = e^x \right\}

Nikolay