Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 29
d m lying in theplane tt must be regarded as having their point ofintersection Im situated on the Line at Infinity in tt. Note II. If l^ and m^ he two parallel lines lyingin TT, and l^ and m^ two other ^parallel lines lying inTT, hut such that l^, etc., is not parallel to U, etc., thenmust l-jn^… … Fio. 7. that the projection of I on to tt may he tJte Line atInfinity on tt. Choose as ir a plane parallel to the plane O^ (i.e. theplane containing the point O and the line I). Then it THE STRAIGHT LINE 9 is plain tliat tlio line joining O to any point P on Iwill be parallel to the plane tt, i.e.…
Geometry, Projective
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