Jeroen Demeyer on Mon, 15 Sep 2014 08:31:38 +0200 |
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Re: precision of result when adding t_REAL with lots of cancellation |
On 2014-09-14 23:27, Bill Allombert wrote:
Given a polynomial f over a number field, give a vector with the number of real roots of phi(f), where phi ranges over the real embeddings.On Mon, Aug 18, 2014 at 10:52:57PM +0200, Jeroen Demeyer wrote:Let me add that having a nfpolsturm() function would also be useful.What would this function do ?
For Denis Simon's script, we only need the number of roots on the real line, but you could also have a version with endpoints, where the endpoints are also number field elements.
Importantly, since both the input and output will be exact, this should be done in a way which does not depend on the realprecision.
Cheers, Jeroen.