Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 310
this point to the lineAA. The double points of II are also points of C*. The point Ais not a double point of II by hypothesis. It is evident, however,that every other point common to the two conies C2 and C2 is adouble point. If C2 and C2 intersect again in three distinct points L, M, N, thelatter… … 296 TWO-DIMENSIONAL PKOJECTIVITIES [Chap, x and the line MN and the common tangent at M for double lines(fig. 106); it is then of Type II. If, finally, the two conies havecontact of the second order at a point L = M=N, distinct from A,the collineation has the single double line which is tangent to…
Geometry, Projective
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