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syntex error

asked 2016-09-16 00:42:34 -0600

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[this line is inserted to help code formatting]

p=(2^3)
print "Prime field P=",p
F.<a> = GF(p);F
K.<b> = F.extension(x^2+(a^2+a+1)*x +a^2) ;K

when i run the code following error obtained on my macbook sage terminal and sage math cloud

Prime field P= 8
Finite Field in a of size 2^3

Error in lines 4-4
Traceback (most recent call last):
  File "/projects/sage/sage-7.3/local/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 957, in execute
    exec compile(block+'\n', '', 'single') in namespace, locals
  File "", line 1, in <module>
  File "sage/rings/finite_rings/finite_field_base.pyx", line 1193, in sage.rings.finite_rings.finite_field_base.FiniteField.extension (/projects/sage/sage-7.3/src/build/cythonized/sage/rings/finite_rings/finite_field_base.c:12767)
    E = Field.extension(self, modulus, name=name, embedding=embedding)
  File "sage/rings/ring.pyx", line 1486, in sage.rings.ring.CommutativeRing.extension (/projects/sage/sage-7.3/src/build/cythonized/sage/rings/ring.c:13322)
    poly = poly.polynomial(self)
  File "sage/rings/polynomial/multi_polynomial.pyx", line 449, in sage.rings.polynomial.multi_polynomial.MPolynomial.polynomial (/projects/sage/sage-7.3/src/build/cythonized/sage/rings/polynomial/multi_polynomial.c:6868)
    raise ValueError("var must be one of the generators of the parent polynomial ring.")
***ValueError: var must be one of the generators of the parent polynomial ring.**
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answered 2016-09-16 08:27:07 -0600

nbruin gravatar image

You didn't define "x", so your result depends on what its value happens to be. What the error indicates (although perhaps not so clearly) is that you need:

 Fx.<x>=F[]

before the definition of K.

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Asked: 2016-09-16 00:42:34 -0600

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Last updated: Sep 16 '16