Here we consider the three circles with diameters the segments (X

Here is the picture of the case in which the circle bundle is of intersecting type, hence points H

The case of circle bundle of non-intersecting type, and consequently real points H

By the way, these are exactly the configurations of four points {A,B,C,D} and line (e) for which there is no conic passing through the four points and tangent to (e). Look at FourPtsAndTangent.html for a discussion on that.

DesarguesInvolution2.html

DesarguesInvolution3.html

DesarguesInvolutionComplex.html

FourPtsAndTangent.html

Involution.html

InvolutionBasic2.html

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