©2009–2022 Jiří Lebl
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Version 5.6 (volume I) and 2.6 (volume II)
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During the writing of this book, the author was in part supported by NSF grant DMS-0900885 and DMS-1362337.
The date is the main identifier of version. The major version / edition number is raised only if there have been substantial changes. Each volume has its own version number. Edition number started at 4, that is, version 4.0, as it was not kept track of before.
https://www.jirka.org/ra/ for more information (including contact information). The LaTeX source for the book is available for possible modification and customization at github: