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Real projective plane

In mathematics, the real projective plane, denoted ⁠RP2{\displaystyle \mathbf {RP} ^{2}}⁠ or ⁠P2{\displaystyle \mathbb {P} _{2}}⁠, is a two-dimensionalprojective space, similar to the familiar Euclidean plane in many respects but without the concepts of distance, circles, angle measure, or parallelism.

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