[OS X TeX] Working right with subequations

Christian Burk maillists at gmx.de
Tue Jan 2 20:14:45 CET 2007


Thanks...!
That did the trick.

Chrsitian



Am 02.01.2007 um 19:47 schrieb Sam Cox:

>
> On Jan 2, 2007, at 1:30 PM, Christian Burk wrote:
>
>> Hallo,
>>
>> I would like to use the subequations feature of amsmath.
>>
>> I have an equation environment with \label{eq:1} and this equation  
>> is numbered with 0.1.
>> Afterwards I have the subequations environment consisting of two  
>> equations with \label{eq:1A} and \label{eq:1B}, but these two  
>> equations are numbered 0.2a and 0.2b.
>>
>> How could I achieve that the equations with the label 1A and 1B  
>> get the number 0.1a and 0.1b?
>
> There may be a better way but this works.  Use \addtocounter 
> {equation}{-1} after the equation and before the subequation.  Here  
> it is:
>
> \documentclass[a4paper,12pt,chapterprefix,abstracton]{scrreprt}
> \usepackage{amsmath}
>
> \begin{document}
>
> \begin{equation} \label{eq:1}
> \underline{M} \ \underline{\ddot{u}} + \underline{C} \ \underline 
> {\dot{u}} + \underline{S} \ \underline{u} = \underline{f}
> \end{equation}
> \addtocounter{equation}{-1}
> \begin{subequations}
>   \begin{align}
>     u &= \left(\begin{array}{c}u_1 \\ \vdots \\ u_k \\ \vdots \\ u_N 
> \end{array}\right) \label{eq:1A} \\
>     u &= \left(\begin{array}{c}u_2 \\ \vdots \\ u_k \\ \vdots \\ u_N 
> \end{array}\right) \label{eq:1B}
>   \end{align}
> \end{subequations}
>
> \end{document}
>
> Sam
>
>
>
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