1) At
http://www.math.ucla.edu/~jimc/mathnet_d/sage/reference/sage/rings/polynomial/polynomial_element.html#sage.rings.polynomial.polynomial_element.Polynomial.discriminant
there is example containing line "f = x^2 + a + b". Should it be "f = x^2
+ a*x + b"?
2) How can I compute symbolic discrimant of for example cubic? This works:
R.<a, b> = QQ[]
f = x^2 + a*x + b
f.discriminant();
and this does not:
R.<a, b, c> = QQ[]
f = x^3 + a*x^2 + b*x + c
f.discriminant();
(Again, I remember I was able to do this with Sage -- and now I don't find
it anymore. Arghs!)
--
Jori Mäntysalo
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