Igor Schein on Tue, 19 Jan 1999 19:23:19 -0500


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bug in nfsubfields() - revisited 

On Wed, Jan 06, 1999 at 10:17:34PM -0500, Igor wrote:
> Hi,
> 
> another one of post-2.0.11 bugs:
> 
> ? nfisincl(x^2-2,x^4-2*x^2+9)
> [-1/6*x^3 + 5/6*x, 1/6*x^3 - 5/6*x]
> ? nfsubfields(nfinit(x^4-2*x^2+9),2)
> []
> ?
>       
> 
> Igor
> 

Even after the patch, nfsubfields() fails to work for some
polynomials.  I came up with x^6 - 2*x^5 + 2*x^3 + 7*x^2 - 8*x + 13
This one has index=533.

So the pattern continues to be polynomials with cyclotomic subfield
and a high index ( last time it was index=24 ).

Igor