22 Dec
2017
22 Dec
'17
9:09 a.m.
Hi Vitaly, On 11/30/2017 05:16 PM, Vitaly Magerya wrote:
> factor((2*x-l)^2*(-1+6*x-l)*(-1+3*x-l)*(-2+4*x-l)*(1+4*x-l)*(4*x-l)*(2+4*x-l));
At this point ginsh either hangs (80% of cases), or gives the correct result (20% of cases).
[...]
So, any ideas on the nature of this problem, and how to fix it?
How did you find this polynomial which makes Hensel lifting keep failing? How many of them are there? Are they always multivariate? Do they always fail sometimes, work at other times? If the answer to the last two questions is yes, then we might add a stop condition and when that has been reached, try factorizing with an alternative permutation of symbols. just an idea -richy. -- Richard B. Kreckel <https://in.terlu.de/~kreckel/>