> 
> > - given x and sqrt(x) as kernels
> 
> I get it that x and sqrt(x) can both appear as kernels; is it possible
> that there are three or more kernels?

In general you may have many kernels, for exmaple
look at derivative of:

atan((exp(x) + x + 1)/(exp(x) - x - 1))

There are two kernels here (exp(x) and x).  I am not sure
if Rioboo is used here, but at least some simplification
is done.
-- 
                              Waldek Hebisch

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