sage: var("a, b, c") (a, b, c) sage: foo=(a-b)*(b-c) ; foo (a - b)*(b - c)
Note that :
sage: foo.expand() a*b - b^2 - a*c + b*c
>From foo.list? :
Docstring: Return the coefficients of this symbolic expression as a
polynomial in x. INPUT: * "x" -- optional variable. OUTPUT: A list of
expressions where the "n"-th element is the coefficient of "x^n" when self
is seen as polynomial in "x".
Therefore :
sage: foo.list() [-b^2 + b*c, b - c]
Is indeed the list of foo’s coefficients of powers of a.
What you seek is :
sage: foo.operands() [a - b, b - c]
HTH,
BTW, a better forum or this kind of questions is probably ask.sagemath.org.
Le lundi 23 octobre 2023 à 18:23:32 UTC+2, Rolandb a écrit :
> Hi,
>
> I am surprised by the output (9.8 and 10.1 Ubuntu):
> var('A,B,C') factor((A-B)*(B-C)).list()
> var('A,B,C') factor((A-B)*(B-C)).list()
>
> var('A,B,C')
> factor((A-B)*(B-C)).list()
> [-B^2 + B*C, B - C]
>
> I expected [B - A, B - C]. Any explanation?
>
> Kind regards,
>
> Roland
>
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