Version 6.4 of the Notes on Diffy Qs is up on the website

[Jiří Lebl]

This is a minor update, mostly to fix errata.  Two errata were exercises that needed to be changed to be workable.

See https://www.jirka.org/diffyqs/

List of changes: https://www.jirka.org/diffyqs/changes.html

Best,

Jiri