
 
Caption: Mathematical Models by Arnold Emch  Series 3 (1925) This is a reducedresolution page image for fast online browsing.
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s is the same as before, T h e quartic of N o * 28 degenerates into the zplane and the cubic: x2 ~jjy2 2z2 2z2 1 which reduces to X z z 1 y z = 0, (x2+y2) (z  1)  *(2z2  1) + 2z2  z = 0. The jyplane touches the cubic along h. The intersection k of the planes x = \,z = \ lies on the cubic, and the plane z = 1 touches the cubic along s, the infinite line of the zplane* T h u s the cubic has 7 real lines, of which 4 are absorbed by h and s. Fig. 4 [9]
 