[GiNaC-devel] [GiNaC-list] Issue with derivative of "abs"

[Vladimir V. Kisil]

       Dear Developers,

        To support Pierangelo's suggestion from here:

https://www.ginac.de/pipermail/ginac-list/2020-June/002301.html

  I am forwarding it to this list as a Git patch attached to this email.

  Best wishes,
  Vladimir
--
Vladimir V. Kisil                 http://www.maths.leeds.ac.uk/~kisilv/
  Book:     Geometry of Mobius Transformations     http://goo.gl/EaG2Vu
  Software: Geometry of cycles          http://moebinv.sourceforge.net/
  Jupyter: https://github.com/vvkisil/MoebInv-notebooks


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