`Discriminant`¶

Discriminant of a polynomial.

$ wo 'Discriminant[x^2 + b x + c, x]'
b^2 - 4*c

A degree-0 (constant) polynomial has discriminant a^(-2), with the zero polynomial special-cased to 0:

$ wo 'Discriminant[3, x]'
1/9

$ wo 'Discriminant[0, x]'
0

Discriminant¶