Inconsistency regarding QQ and ZZ?

[Rolandb]

Hi, QQ[] is a field of rationals fractions and ZZ[] of integers.

The following puzzles me:

sage: R.<A,d>=QQ[]
sage: factor(A^d+2*A-3)
Traceback (most recent call last):
...
TypeError: non-integral exponents not supported

sage: R.<A,d>=ZZ[]
sage: factor(A^d+2*A-3)
Traceback (most recent call last):
...
TypeError: non-integral exponents not supported

Or is the message "non-integral exponents not supported" not clear to me?

Sage Version 5.7 Windows

Roland

[Robert Bradshaw]

The syntax "R.<A,d> = QQ[]" creates a polynomial ring in two
variables, with generators A and d (bound to the current session). A^d
is not a polynomial in A and d over QQ.

sage: R.<A,d>=QQ[]
sage: R
Multivariate Polynomial Ring in A, d over Rational Field

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