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Is there a simple way to obtain a right aligned first column in the cases environment. As far as I can see, mathtools does not add such an option.

(This question might be read as a request for enhancement on mathtools... :) )

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1 Answer 1

up vote 8 down vote accepted

The mathtools package actually provides this extension as a feature already! Cases can be created using the following syntax:

\newcases{<case name>}{<space>}{%
  <left col align>}{<right col align>}{<left delim>}{<right delim>}

The regular dcases case is defined in the following way:

\newcases{dcases}{\quad}{%
  $\m@th\displaystyle{##}$\hfil}{$\m@th\displaystyle{##}$\hfil}{\lbrace}{.}

Consequently, you would probably be interested in:

\makeatletter
\newcases{mycases}{\quad}{%
  \hfil$\m@th\displaystyle{##}$}{$\m@th\displaystyle{##}$\hfil}{\lbrace}{.}
\makeatother

Modified cases

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Ah! This is not in the docs... –  Mariano Suárez-Alvarez Sep 5 '11 at 6:20
    
Remember to add \makeatletter before and \makeatother after using this. I've updated my answer to include this. –  Werner Sep 5 '11 at 6:23
2  
Since it require some knowledge to use, it is only used internally. Suggest a good name for it, and I might add it –  daleif Sep 5 '11 at 8:41
    
@daleif: so did you add it? –  adn Dec 30 '11 at 9:20

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