[OS X TeX] Exercises

[George Gratzer]

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
>>
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>
> ----------- Please Consult the Following Before Posting -----------
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>