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Published online by Cambridge University Press: 20 January 2009
be the binary cubic whose coefficients a1, are complex numbers represented on the Argand Plane. Then if its roots are z1, z2, z3, the three corresponding points form the vertices of a triangle A1 A2 A3. Let this triad of points be said to represent the cubic. Then its Hessian
is represented by a certain pair of other points; likewise every first polar
associates a definite pair of points (z) with any given point (y).
* Cf. Grace and Young, Algtbra of Invariants (190) p.
* See Grace and Young, loc. cit., pp. 209, 211.
* Cf. Graoe and Young, loc. cit.