#15074: Allowing 'textbook style' derivative output from pynac
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Reporter: mbejger | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.12
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by nbruin):
I think this has been proposed before. The problem is that there is not
enough information available to use Leibniz notation. Consider the
following examples and decide
{{{
sage: var("x,y,u,v")
sage: function('f')
sage: ddf=f(x,y).diff(x,y).operator()
sage: ddf(x^2+y^2,x-y) ## 1
D[0, 1](f)(x^2 + y^2, x - y)
sage: ddf(v,u) ## 2
D[0, 1](f)(v, u)
sage: ddf(x,x^2+y) ## 3
D[0, 1](f)(x, x^2+y)
}}}
I think Maple uses Leibniz notation if it applies (i.e., all parameters
are distinct pure variables) and reverts to operator (Euler?) notation
otherwise; also indexed by parameter position rather than name.
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Ticket URL: <http://trac.sagemath.org/ticket/15074#comment:1>
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