5

This is what I want:This is what I want. This is what I get:This is what I get

I want two (or three) equations in cases and I want to align the equal sign (that's no problem). And then I want to have some text in every row. The text should be right aligned and I want dots between the equation and the text, just like it is when I don't have cases. I don't know how to right align the texts inside the cases. Here is my code:

\documentclass[a5paper]{book}

    \usepackage[top=1.8cm, bottom=2.7cm, left=2.7cm, right=1.8cm]{geometry}

    \usepackage{amsthm,amsmath}

    \makeatletter
    \renewcommand \dotfill {\leavevmode \cleaders \hb@xt@ .33em{\hss .\hss }\hfill \kern \z@}
    \makeatother

    \newenvironment{lcases}
    {\left\lbrace\begin{aligned}}
        {\end{aligned}\right.}

    \begin{document}    
        \begin{enumerate}
            \item $AB=CD$ \dotfill text
            \item $AB=CD$ \dotfill more text
            \item $\begin{lcases}
            &GB=DE \leaders\hbox{\hss .\hss }\hskip \textwidth minus \textwidth \text{text}\\
            &AB=CD \leaders\hbox{\hss .\hss }\hskip \textwidth minus \textwidth \text{more text}
            \end{lcases}$
        \end{enumerate}         
    \end{document}
2
  • What do you mean by "right align"? Is the text flush right with the page margin? Or are they just somewhere on the right and right-aligned with one another?
    – Werner
    Jun 2 '18 at 15:46
  • raggedleft (just the text in the cases), the equation should be where they are. I uploaded new pictures.
    – Anna O
    Jun 2 '18 at 17:09
3

This is not what you want. I don't understand why in each line of cases, you use some text at the end of line. If so, you can use, for example $AB=CD$ \dotfill 1 point without using cases. In my answer, in the cases, I also use \dotfill for all lines.

\documentclass[a5paper]{book}
  \usepackage[top=1.8cm, bottom=2.7cm, left=2.7cm, right=1.8cm]{geometry}
\usepackage{amsthm,amsmath}
  \begin{document}
        \begin{enumerate}
            \item $AB=CD$ \dotfill 1 point
            \item $AB=CD$ \dotfill 2 points
            \item $\begin{cases}
                 GB=DE\\
                 AB=CD.                 
                 \end{cases}$ \dotfill 2 points
        \end{enumerate} 
    \end{document}

enter image description here

2

An easy way to obtain the desired result, namely

Output of the first code sample

is to use the tabularx environment (requires the tabularx package). Indeed, the above printout has been produced with the following code:

% My standard header for TeX.SX answers:
\documentclass[a4paper]{article} % To avoid confusion, let us explicitly 
                                 % declare the paper format.

\usepackage[T1]{fontenc}         % Not always necessary, but recommended.
% End of standard header.  What follows pertains to the problem at hand.

\usepackage{amsmath}
\usepackage{tabularx}

\makeatletter

\newcommand*\Annadotfill{%
    \leavevmode
    % Do you really want "\cleaders"?
    \cleaders \hb@xt@ .33em{\hss .\hss }\hfill
    \kern \z@
}
\@ifdefinable\@Anna@brace@width{\newdimen\@Anna@brace@width}
\settowidth\@Anna@brace@width{%
    $\left\{\vbox{\vskip \@m \p@}\right.\kern -\nulldelimiterspace$%
}
\newenvironment{Annacases}{%
    \left\{%
    \tabcolsep \z@
    \def\arraystretch{1.2}% linespread: adjust as you please
    \tabularx{\dimexpr \linewidth-\@Anna@brace@width \relax}%
                {>{$}r<{$}>{${}}X<{$}}%
}{%
    \endtabularx
    \right.%
    \kern -\nulldelimiterspace
}

\makeatother



\begin{document}

Some text before the enumeration.
\begin{enumerate}
    \item $AB=CD$ \Annadotfill text;
    \item $AB=CD$ \Annadotfill longer text;
    \item
        $
            \begin{Annacases}
                AB &= CD\Annadotfill\text{text;}\\
                AB &= CD+EF+GH\Annadotfill\text{longer text;}\\
                MN+XY &= PQ\Annadotfill\text{longer text, and more.}
            \end{Annacases}
        $
\end{enumerate}
Some text after the enumeration.

\end{document}

However, there must be a more efficient method, using primitive TeX commands…


Previous Attempt, Which I Had Deleted

Something like this?

Output of the following code

This is the code:

% My standard header for TeX.SX answers:
\documentclass[a4paper]{article} % To avoid confusion, let us explicitly 
                                 % declare the paper format.

\usepackage[T1]{fontenc}         % Not always necessary, but recommended.
% End of standard header.  What follows pertains to the problem at hand.

\usepackage{mathtools} % also loads "amsmath"

\makeatletter

\newcommand*\annadotsfill{\leaders\hbox{.\,}\hskip 2em \@plus 1fill \relax}
\newcases{annacases}
    {} % separation between columns
    {$\m@th\displaystyle\hfil##$} % left preamble
    {$\m@th\displaystyle{}##$} % right preambel
    {\lbrace}{.} % delimiters

\makeatother



\begin{document}

Some text before the equation.
\[
    \begin{annacases}
        AB &= CD\annadotsfill\text{text}\\
        AB &= CD+EF+GH\annadotsfill\text{longer text}\\
        MN+XY &= PQ\annadotsfill\text{longer text, and more}
    \end{annacases}
\]
Some text after the equation.

\end{document}

Unfortunately, I cannot dwell on explanations right now; I’ll try to edit this answer later on.

1
  • Thanks! It works perfect. But when I try to get wide in enumerate it doesn't work and the same for if I use hspace before the Annacases. I post a new question because this was not in my origin question.
    – Anna O
    Jun 4 '18 at 9:41

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