Projective geometry for use in colleges and schools (1911)
Milne, William P. (William Proctor), 1881- · London : Macmillan · leaf 108
Fig. 38. The description of the Dual (or Reciprocal) Figurewould therefore be, A and B ai^e two points whosejoin touches the conic S\ RECIPROCATION. THE PRINCIPLE OF DUALITY 87 Example 3. Reciprocate the figure: … Fig. 30. Description of Original Figure.The join of the two ^points A, B cids the conic S intwo points P, Q that harmonically separate A, B. Dual (or Reciprocal) Figure. The intersection of the two lines a, h lies on twotangents p, q that harmonically separate a\ h.
Geometry, Projective
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