#4780: relative number field constructor -- error message when given poly of
degree < 1 is bad
---------------------------+------------------------------------------------
Reporter: was | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.0.1
Component: number theory | Keywords:
---------------------------+------------------------------------------------
Comment(by mhansen):
This seems to be better now:
{{{
----------------------------------------------------------------------
| Sage Version 4.0.1.rc1, Release Date: 2009-06-04 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: sage: K.<a> = NumberField(x^2 + 1)
sage: sage: L.<b> = NumberField(K['y'](1))
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
/home/mhansen/.sage/temp/sage.math.washington.edu/25032/_home_mhansen__sage_init_sage_0.py
in <module>()
/scratch/mhansen/release/4.0.1/rc1/sage-4.0.1.rc1/local/lib/python2.5
/site-packages/sage/rings/number_field/number_field.pyc in
NumberField(polynomial, name, check, names, cache, embedding)
415
416 if isinstance(R, NumberField_generic):
--> 417 S = R.extension(polynomial, name, check=check)
418 if cache:
419 _nf_cache[key] = weakref.ref(S)
/scratch/mhansen/release/4.0.1/rc1/sage-4.0.1.rc1/local/lib/python2.5
/site-packages/sage/rings/number_field/number_field.pyc in extension(self,
poly, name, names, check, embedding)
2920 raise TypeError, "the variable name must be
specified."
2921 from sage.rings.number_field.number_field_rel import
NumberField_relative
-> 2922 return NumberField_relative(self, poly, str(name),
check=check, embedding=embedding)
2923
2924 def factor(self, n):
/scratch/mhansen/release/4.0.1/rc1/sage-4.0.1.rc1/local/lib/python2.5
/site-packages/sage/rings/number_field/number_field_rel.pyc in
__init__(self, base, polynomial, name, latex_name, names, check,
embedding)
274 # future, is_irreducible should be made faster for
275 # polynomials over number fields -- see ticket
#4724
--> 276 raise ValueError, "defining polynomial (%s) must
be irreducible"%polynomial
277
278 self.__gens = [None]
ValueError: defining polynomial (1) must be irreducible
}}}
Comments?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4780#comment:1>
Sage <http://sagemath.org/>
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