Any two ranges 
and 
which are situated on the
same or different lines are said to be homographic when the cross
ratio of any four points on one range is equal to the cross
ratio of the corresponding points of the other range.
Homographic
See also
Cross Ratio, Linear Fractional Transformation, Möbius TransformationExplore with Wolfram|Alpha
References
Lachlan, R. "Homographic Ranges and Pencils." §433-439 in An Elementary Treatise on Modern Pure Geometry. London: Macmillian, pp. 279-282, 1893.Referenced on Wolfram|Alpha
HomographicCite this as:
Weisstein, Eric W. "Homographic." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Homographic.html