A Generalisation of a Theorem of E. Toeplitz
A Generalisation of a Theorem of E. Toeplitz
In the Mathematische Annalen , 11 (1877), 440–444, E. Toeplitz has proved the following theorem: If three quadrics are polar quadrics of three points with respect to a cubic surface, then their (2, 2, 2) invariant vanishes ; the invariant being of the second degree in the coefficients of each …