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The equation of a rational plane curve derived from its parametric equations (Second paper)

1917
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Bulletin of the American Mathematical Society
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a point which lies in the polar r -2 flat of a qua f (a) = 0. Whence it follows that any r -2 flat Sw^a* = 0 is invariant to each of the infinitesimal transformations of Y represented by the poles of this flat qua f (a) = 0; and thus, if the poles of this flat do not all lie in an r -2 flat, it follows that the infinitesimal transformations of G represented by points in the r -2 flat Huiai = 0 generate an invariant subgroup of G. If the adjoint group V has a quadratic invariant of non-zero

doi:10.1090/s0002-9904-1917-02942-4
fatcat:fjzwiszcwfaetjrrfjghmdid6q