Subexercises or exercise parts (like 1a, 1b, 1c).

[jonascj]

I quite often see, and myself create, exercises which consist of multiple subexercises or parts, like this:

# Exercise 1
Two cars are traveling in opposite directions. 
They are 2.7km apart, driving 50km/h and 65km/h, respectively.
a) Write the equations of motion for the two cars.
b) Find the time t at which the two cars will meet.
c) Find the distance traveled by the cars when they meet.

As far as I can see, this is not a feature directly provided by the xsim package. Any recommendations on how to achieve this by other means?

A solution with the enumerate or itemize environment works, but maybe there are other ways.

\begin{exercise}
Two cars travel ....
\begin{enumerate}
\item Write the equations ...
\item Find the time ...
\item Find the distance ...
\end{enumerate}
\end{exercise}

[psttf]

Regarding xsim-specific features of subexercises it would be nice to print just a single subexercise while keeping the parent-exercise text.

E.g. in textbook I want the following:

Bring to normal form:
(1) Some formula. (2) Another formula.

But I want to reference only one of such exercises in exam sheet:

Bring to normal form:
Some formula

[cgnieder]

This is an interesting problem and definitely something worth being implemented. This will have to wait, though, as I have way too less time for package development lately…

[cgnieder]

Currently it seems that nested exercises might be a way for some people, cf. issue #57

[cgnieder]

I'll close this as duplicate of issue #67. We'll discuss this matter there more closely.