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$\begingroup$ Thank you very much! When you say 'Bestvina's course notes "Folding Graphs and Applications" ' you mean a pdf with the titlie "Folding graphs and applications, d’apr`es Stallings"? $\endgroup$
– 1123581321
Commented Sep 29, 2019 at 17:45
$\begingroup$ @giannispapav yes! that's the one. I found the process of thinking through all the exercises very helpful. $\endgroup$
– Robbie Lyman
Commented Sep 29, 2019 at 17:46
$\begingroup$ Thanks again !! $\endgroup$
– 1123581321
Commented Sep 29, 2019 at 17:48

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```
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