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of the points of S₂ onto itself which preserves collinear points and is called a perspective collineation (central collineation in more modern terminology). Let ? be a perspective collineation of S₂. Each point of the line of intersection of S₂ and T₂ will be fixed by ? and this line is called the axis of ?. Let point P be the intersection of line OO* with the plane S₂. P is also fixed by ? and every line of S₂ that passes through P is stabilized

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