[GiNaC-list] Given a formal iterated derivative (GiNaC::fderivative), what actually is it?

[Vladimir V. Kisil]

>>>>> On Sat, 9 Apr 2016 23:59:36 +0200, "Richard B. Kreckel" <kreckel at in.terlu.de> said:
    >> f(x,y).diff(x, 3).diff(y, 2)
    >> which is printed as
    >> D[0,0,0,1,1](f)(x,y)
    >> This is fantastic.

    RK> Hmmm...  Wouldn't it be more fantastic if it were printed
    RK> D[x,x,x,y,y](f)(x,y)?

    But how to print f(x+y,x-y).diff(x, 3).diff(y, 2) in this case?

-- 
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/