9) the harmonic invariant of the qua- drics or conics whose equations are connected by it. 67. ... it represents a twisted quartic of the first family, and that all the properties of sphero-quartics may be applied projectively to it (see observations, art.
Title | : | On cyclides and sphero-quartics |
Author | : | John Casey |
Publisher | : | - 1871* |
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