TikZ: How to draw an arrow in the middle of the line?
How can I draw delta-complex diagrams like ones on this page from Hatcher's book:
using TikZ (or any other LaTeX package)? For my documents I usually draw them by hand and scan them in but I'd like to learn how to do it with LaTeX, so it'll be neater, self-contained, editable, copy-paste-able, etc.
I'm sorry, I've tried to figure this out myself but nothing came even close to working. Thanks for your help.