[OS X TeX] Exercises

[George Gratzer]

Michael,

More trouble in paradise...

I am now using your exercises environment, it displays with perfection.

But.

Sample code (short):

\begin{exercises}

\subsubsection*{Orders}

\item Define $x < y$ to mean \dots label{Exer:I.1.1}

\item Let the binary relation $ < $ satisfy the conditions of Exercise~ 
\ref{Exer:I.1.1}.\label{Exer:I.1.2}
\end{exercises}

These two exercises are numbered "1.1" and "1.2", as they should be,  
they are the first two exercises in Section 1. But \ref{Exer:I.1.1}  
produces "1", not "1.1".

I do not understand.


GG


On 16-Apr-09, at 5:29 PM, Michael Sharpe wrote:

> To allow more space for the exercise number and section number, you  
> may wish to change the exercises macro so it reads something like
>
> \newenvironment{exercises}
>    {
>    \begin{xcb}{}\noindent\textbf{Exercises}
> \settowidth{\leftmargini}{NNNN.\hskip\labelsep}
>    \begin{enumerate}
> \let\olditem\item
> \def\staritem{\let\exerstar\par\olditem }
> \renewcommand{\item}{\let\exerstar\empty\olditem }
> \renewcommand{\labelenumi}{\ifx\exerstar\empty\else*\fi\thesection. 
> \theenumi.}
>  }
> {\end{enumerate}\end{xcb}}
>
> Note that the \settowidth line was moved to just above  
> \begin{enumerate}.
>
> Michael
>
> On Apr 16, 2009, at 2:26 PM, George Gratzer wrote:
>
>> And one more question. What do I need to do so that the number of  
>> the exercise is of the form 4.5, where 4 is the section number.
>>
>> I could do this if I knew the name of the counter...
>>
>> GG
>>
>>
>> On 16-Apr-09, at 4:14 PM, George Gratzer wrote:
>>
>>> You are right, the * should come before the number (for  
>>> alignment). How do i do that/
>>>
>>> GG
>>>
>>> On 10-Apr-09, at 1:33 PM, Michael Sharpe wrote:
>>>
>>>>
>>>> On Apr 10, 2009, at 9:56 AM, George Gratzer wrote:
>>>>
>>>>> In my new book, I have exercises at the end of each section. I  
>>>>> use the xcb environment from amsbook.cls:
>>>>>
>>>>> \newenvironment{xcb}{%
>>>>> \setcounter{enumi}{0}%
>>>>> \settowidth{\leftmargini}{\labelenumi\hskip\labelsep}%
>>>>> \setcounter{enumii}{4}% letter d
>>>>> \settowidth{\leftmarginii}{\labelenumii\hskip\labelsep}%
>>>>> \@startsection{section}% counter name; ignored because of the
>>>>>                            % * below
>>>>> {1}% sectioning level
>>>>> {\z@}% indent to the left of the section title
>>>>> {18\p@\@plus2\p@}% vertical space above
>>>>> {1sp}% Space below of 13pt base-to-base, so none needs to be added
>>>>>  % here; but \z@ would cause the following text to be run-in, so  
>>>>> we
>>>>>  % use 1sp instead.
>>>>> {\bfseries}% The font of the subsection title
>>>>> *% always unnumbered
>>>>> }{%
>>>>> \par
>>>>> }
>>>>>
>>>>>
>>>>> modified as follows:
>>>>>
>>>>> \newenvironment{exercises}
>>>>> {
>>>>> \begin{xcb}{}\noindent\textbf{Exercises}
>>>>> \begin{enumerate}
>>>>> \renewcommand{\labelenumi}{\theenumi.}
>>>>> \settowidth{\leftmargini}{NN.\hskip\labelsep}
>>>>> }
>>>>> {\end{enumerate}\end{xcb}}
>>>>>
>>>>> and then
>>>>>
>>>>> \begin{exercises}
>>>>>
>>>>> \item
>>>>>
>>>>> \begin{exercises}
>>>>>
>>>>> works well.
>>>>>
>>>>> Problem: I want the difficult exercises marked with a *:
>>>>>
>>>>> 25*.
>>>>>
>>>>> How could I do that? How do I modify one number, without  
>>>>> effecting the rest?
>>>>>
>>>>
>>>> One way is to redefine the exercises environment as follows.
>>>>
>>>> \newenvironment{exercises}
>>>> {
>>>> \begin{xcb}{}\noindent\textbf{Exercises}
>>>> \begin{enumerate}
>>>> \let\olditem\item
>>>> \def\staritem{\let\exerstar\par\olditem }
>>>> \renewcommand{\item}{\let\exerstar\empty\olditem }
>>>> \renewcommand{\labelenumi}{\theenumi\ifx\exerstar\empty\else*\fi.}
>>>> \settowidth{\leftmargini}{NN.\hskip\labelsep}
>>>> }
>>>> {\end{enumerate}\end{xcb}}
>>>>
>>>> You might want to change the alignment of the numbers, or perhaps  
>>>> place the * before the exercise number---that's a simple change.
>>>>
>>>> Michael
>>>>
>>>> ----------- Please Consult the Following Before Posting -----------
>>>> TeX FAQ: http://www.tex.ac.uk/faq
>>>> List Reminders and Etiquette: http://email.esm.psu.edu/mac-tex/
>>>> List Archive: http://tug.org/pipermail/macostex-archives/
>>>> TeX on Mac OS X Website: http://mactex-wiki.tug.org/
>>>> List Info: http://email.esm.psu.edu/mailman/listinfo/macosx-tex
>>>>
>>>
>>> ----------- Please Consult the Following Before Posting -----------
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>>> List Reminders and Etiquette: http://email.esm.psu.edu/mac-tex/
>>> List Archive: http://tug.org/pipermail/macostex-archives/
>>> TeX on Mac OS X Website: http://mactex-wiki.tug.org/
>>> List Info: http://email.esm.psu.edu/mailman/listinfo/macosx-tex
>>>
>>
>> ----------- Please Consult the Following Before Posting -----------
>> TeX FAQ: http://www.tex.ac.uk/faq
>> List Reminders and Etiquette: http://email.esm.psu.edu/mac-tex/
>> List Archive: http://tug.org/pipermail/macostex-archives/
>> TeX on Mac OS X Website: http://mactex-wiki.tug.org/
>> List Info: http://email.esm.psu.edu/mailman/listinfo/macosx-tex
>>
>
> ----------- Please Consult the Following Before Posting -----------
> TeX FAQ: http://www.tex.ac.uk/faq
> List Reminders and Etiquette: http://email.esm.psu.edu/mac-tex/
> List Archive: http://tug.org/pipermail/macostex-archives/
> TeX on Mac OS X Website: http://mactex-wiki.tug.org/
> List Info: http://email.esm.psu.edu/mailman/listinfo/macosx-tex
>