Projective differential geometry is a branch of mathematics that studies the properties of geometric objects that are invariant under projective transformations. These transformations can be thought of as transformations that preserve the "straightness" of lines but do not necessarily preserve distances or angles. In projective geometry, points, lines, and higher-dimensional analogs are considered in a more abstract manner than in Euclidean geometry, focusing on the relationships between these objects rather than their specific measurements.
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