Indeed this is a bug, and the following version is even funnier
sage: z.is_one()
True
sage: z.is_constant()
False
Vincent
Le 16/01/2019 à 06:07, Henry Liu a écrit :
Hi all,
LaurentPolynomialRing does not handle constants correctly. Here is an
example:
sage: R.<x,y> = LaurentPolynomialRing(QQ)
sage: z = x / x; z
1
sage: z.is_constant()
False
sage: z in ZZ
False
sage: z == R.one()
True
sage: z.parent()
Multivariate Laurent Polynomial Ring in x, y over Rational Field
sage: R.one() in ZZ
True
sage: version()
'SageMath version 8.5, Release Date: 2018-12-22'
Can someone confirm this is a bug?
Thanks,
Henry
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