## Colophon Colophon

©2008–2019 Jiří Lebl

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Version 6.1pre

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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. Edition number started at 5, that is, version 5.0, as it was not kept track of before.

See https://www.jirka.org/diffyqs/ for more information (including contact information). The LaTeX source for the book is available for possible modification and customization at github: https://github.com/jirilebl/diffyqs