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Rename summary section.
Improve organization of Summary section.
Add "Summary" section.
Add text for the orientation-reversing section.
Add an animation of a reflection.
Expand and improve parabolic section.
Tweak part of elliptic section.
Remove redundant sentence.
Add a "Preliminaries" section.
Rework the sections paying attention to sign.
Update the hyperbolic isometry section to match th
Add glide reflection gif.
Add some tweaks.
Work on the section some more.
Work more on the elliptic isometry section.
Add a figure with all three types.
Add comments re: the trace.
Add missing word.
Mention how to derive the second translation lengt
Tweak some wording.
Add more text.
Add a note re: PSL(2, R).
Mention PSL(2, R).
Mention the identity isometry.
Add caption to hyperbolic isometry picture.
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