COURSE OF PROJECTIVE GEOMETRY


§ 24:


O88
See the proof of the propositions in this section.


O89
See the proof of the propositions in this section.


O90

The projectivity from a tor b that maps S to B, A to S, and C1 to C2, with pappus line AB, generates the conic.
Choose X on a and construct the image point X ' with the theorem of Steiner.
Construct a fifth image point Y ' for Y on a.
XX ' and YY ' are new lines of the conic.
Construct the point of contact on c as in O89.


O91

Construction and explanation are dual to those of the previous problem.


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