Veblen, Oswald, 1880-1960, Young, John Wesley, 1879-1932 · Boston, New York [etc.] Ginn and Company · leaf 311
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… … Fig. 106
Geometry, Projective
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