I have added the function to the master branch of slepc4py. To use it, you 
should do something like this:
  f.setType(SLEPc.FN.Type.COMBINE)
  f.setCombineChildren(SLEPc.FN.CombineType.COMPOSE,fa,fb)
where fa is (c^2-lambda^2) and fb is the square root.

It seems an interesting problem. I would like to know more about it. If you 
want, send a short description of the problem to my personal email or to 
slepc-maint.

Jose


> El 10 ago 2018, a las 10:15, Daniel Kiefer <daniel.kie...@fau.de> escribió:
> 
> That would be great! :)
> 
> I would need this in order to solve an eigenvalue problem with a sqrt(c^2 - 
> lambda^2) term.
> 
> Looking forward to your message.
> 
> Best regards
> Daniel
> 
> On 09.08.2018 21:36, Jose E. Roman wrote:
>> I will add it in the next days and let you know.
>> Jose
>>> El 9 ago 2018, a las 21:07, Daniel Kiefer <daniel.kie...@fau.de> escribió:
>>> 
>>> Dear SLEPc users,
>>> 
>>> I am trying to solve a non-linear eigenvalue problem for which I need to 
>>> use FNCombineSetChildren(). It seems to me that this function is not 
>>> implemented in the Python bindings? Any information or help would be much 
>>> appreciated.
>>> 
>>> Best regards
>>> Daniel Kiefer
>>> 
>>> --
>>> Daniel Kiefer, M.Sc.
>>> Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
>>> Lehrstuhl für Sensorik
>>> Paul-Gordan-Straße 3/5, 91052 Erlangen, Germany
>>> Tel. +49 9131 85 23134, Fax +49 9131 85 23133
>>> 
>>> University of Erlangen-Nuremberg (FAU)
>>> Chair of Sensor Technology
>>> 
> 

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