[Maxima-discuss] poly_discriminant

[Karen K. <kar...@gm...>]

poly_discriminant(a*x^2+b*x+c, x) → b^2-4*a*c (correct)

but

poly_discriminant(x^2/2-x+3, x) → -20 (incorrect)
the right answer is ∆ = -5

So, Maxima's poly_discriminant and resultant functions work incorrectly
(see my previous message:
https://sourceforge.net/p/maxima/mailman/message/37298869/)