Re: interesting ROUND4 behavior

[Xavier-François Roblot <roblot@euler.univ-lyon1.fr>]

[Igor]
> I found 3 polynomials, namely polzagier(18,3), polzagier(34,3) and
> polzagier(42,11), that behave funny when I run factorpadic(pol,2,r).
> I run it at \g5 and grep for 'bound for resultant coeffs:'.
(...)
> Xavier, any idea why ROUND4 behaves like that?

Well, I do believe a bug explains this behavior. Indeed, taking

pol=polzagier(18,3) 

and looking at 

factorback(factorpadic(pol,2,24))-pol 

shows that the result of factorpadic is (very) wrong... I'll take a
closer look next week. Thanks for pointing out the problem.

Xavier