# [OS X TeX] Exercises

George Gratzer gratzer at me.com
Sat Apr 18 23:19:47 CEST 2009

Michael,

This is clear now, thanks. BUT LaTeX writes the 2.5 of Theorem 2.5 in
the aux file, I do not do anything to accomplish this. Could we not
redefine \enumi to contain the section number?

George

On 18-Apr-09, at 3:45 PM, Michael Sharpe wrote:

>
> On Apr 18, 2009, at 12:48 PM, George Gratzer wrote:
>
>> Michael,
>>
>> What is odd that exercises are numbered with the section number, as
>> 1.1, 1.2, etc. Normally, what is displayed is what is stored. Not
>> in this  case, of Exercise 1.2 \ref only remembers 2.
>>
>> In Section 4, everything is consecutively numbered: Corollary 4.6,
>> Theorem 4.7, etc., so that they be easily found. A typical section
>> has 30-40 exercises; it would look funny to have them numbered
>> along with everything else.
>>
>> I do not understand how the Exercises are properly numbered. How do
>> they know the section number? How is it lost with \ref?
>>
>
> George,
>
> The way the section number gets into the exercise label is through
> the line
>
> \renewcommand{\labelenumi}{\ifx\exerstar\empty\else*\fi\thesection.
> \theenumi.}
>
> in the definition of the exercises environment. The segment '\ifx
> \exerstar\empty\else*\fi' places a star, if called for,
> '\thesection' places the section number, and '\theenumi' places the
> value of the counter \enumi which keeps track of the number of the
> item in the current enumerate list. The LaTeX code for \label
> doesn't know about what is written to \labelenumi---it just writes
> the value in \enumi (as well as the current page number) to the .aux
> file.
>
> Best,
>
> Michael
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