PolDisc(P) = Discriminant of polynomial P:

The discriminant of the quadratic {a; b; c} is b^2 − 4*a*c.

The discriminant of the cubic {a; b; c; d} is b^2*c^2 − 4*b^3*d −
4*a*c^3 + 18*a*b*c*d − 27*a^2*d^2.

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