On Aug 5, 2016, at 11:59 , John Cremona wrote:

> Andrew Sutherland reports the following:
> 
> After
> 
> x = polygen(QQ)
> R = QQ[x]
> pol = R([-1,-3,6,4,-5,-1,1])
> K = NumberField(pol,'a')
> I = K.ideal([1,1])
> 
> all is well, but then
> 
> I
> 
> (to display the unit ideal) takes a long, and variable, time.  What is
> going on?  (Don't bother telling me that it is silly to repeat the
> ideal generator, we extracted this from more complicated code while
> debugging.)

FWIW, it happened between 6.10 (the latests one I can build in 10.6.8) and 7.0 
(the first I built on 10.11).  Unless there's a really subtle difference 
between the two versions of OS X.

HTH

--
Justin C. Walker, Curmudgeon at Large
Director
Institute for the Enhancement of the Director's income
-----------
Question 43:
What if the hokey pokey
really *is* what it’s all about?
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