#12922: Implicit derivative
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       Reporter:  mmarco             |        Owner:  burcin
           Type:  enhancement        |       Status:  needs_review
       Priority:  major              |    Milestone:  sage-6.4
      Component:  calculus           |   Resolution:
       Keywords:  implicit           |    Merged in:
  derivative                         |    Reviewers:  Kannappan Sampath
        Authors:  Miguel Marco       |  Work issues:
Report Upstream:  N/A                |       Commit:
         Branch:                     |  39aaf0c4b33a7a5ec0066e64e25cf5e54d197247
  u/mmarco/ticket/12922              |     Stopgaps:
   Dependencies:                     |
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Comment (by knsam):

 For starters, I have the following comments:

 1. The one-line docstring for the function is "incorrect": it computes
 something, yes, but it also returns it. So, please change that to "Return
 <whatever>".
 2. The value error could return the expression `F` explicitly instead of
 saying the generic F. While you are it, please use the `.format` to format
 the string for the output instead.

 Honestly, I have not looked at the math. I will get back about the math
 and the programming part in a bit.

--
Ticket URL: <http://trac.sagemath.org/ticket/12922#comment:25>
Sage <http://www.sagemath.org>
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