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In mathematics, a non-Desarguesian plane is a projective plane that does not satisfy Desargues' theorem , or in other words a plane that is not a Desarguesian plane. The theorem of Desargues is true in all projective spaces of dimension not 2; in other words, the only projective spaces of dimension not equal to 2 are the classical projective geometries over a field. However, David Hilbert found that some projective planes do not satisfy it. The current state of knowledge of these examples is not complete.
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