# Connection of two imaginary points

Given two imaginary points. Construct the line connecting the points.
The two points are each one of the double points of an elliptic involution on a line. These evolutions are respresented by an arrow on the carrier of these points. Vector A and vector B (in red)
A semi circle is constructed on the amplitude of the involutions.
On lina a: Take the intersection of a and b as . Draw and perpendicular. and are inner and outer bisectrixes of triangle
The four points are two pairs of points in the given involution.
Likewise for point B and the four points and
The two ranges of four points X an Y are perspective both from M and from N

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