Okay, I have replaced it by Complex_Main. In fact derivatives are only needed 
in a couple of places.

> On 28 Jun 2018, at 17:03, Florian Haftmann 
> <florian.haftm...@informatik.tu-muenchen.de> wrote:
>> Is it right for this theory to base itself on HOL.Deriv rather than 
>> Complex_Main?
>> Larry
>> section ‹Polynomials as type over a ring structure›
>> theory Polynomial
>> imports
>>  HOL.Deriv
>>  "HOL-Library.More_List"
>>  "HOL-Library.Infinite_Set"
>>  Factorial_Ring
>> begin
> I don't think so, especially the combination of theories from
> HOL-Library with a non-canonical theory entry is weird.
> I am unable to tell on the spot how this has emerged.  Are there any
> suspicious things when HOL.Deriv is replaces by Complex_Main?
> I guess that theory uses some analytical results and hence cannot build
> on Main alone.

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