Note to the reader
The target audience for these lecture notes consists of younger researchers
at the beginning of their careers as well as seasoned researchers in neigh-
boring areas interested in quickly acquiring the viewpoint. The requisite
background for reading this text should be at the level of an introductory
course on geometric group theory or even just hyperbolic groups, though
some comfort with graphs of groups would be helpful. I have attempted to
include all defined terms and notation in an index at the end of the docu-
ment, and hope that the intrepid reader will be able to dive into a chapter
of interest and work outwards.
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