bug in bnfnarrow?

[John Jones <jj@asu.edu>]

I have tried this in several versions of gp 2 and they all produce the
same error.



                    GP/PARI CALCULATOR Version 2.2.1 (alpha)
                i686 running linux (ix86 kernel) 32-bit version
                (readline v4.1 enabled, extended help available)

                       Copyright (C) 2000 The PARI Group

PARI/GP is free software, covered by the GNU General Public License, and 
comes WITHOUT ANY WARRANTY WHATSOEVER.

Type ? for help, \q to quit.
Type ?12 for how to get moral (and possibly technical) support.

   realprecision = 28 significant digits
   seriesprecision = 16 significant terms
   format = g0.28

parisize = 4000000, primelimit = 500000
? 1 - 9*x + 14*x^2 + 28*x^3 - 7*x^4 - 12*x^5 + x^6 + x^7
%1 = x^7 + x^6 - 12*x^5 - 7*x^4 + 28*x^3 + 14*x^2 - 9*x + 1
? bnfnarrow(bnfinit(%))
  ***   non invertible matrix in gauss
?
 

                                 John Jones


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