Collinearity-Preserving Functions between Desarguesian Planes
David S. Carter · Andrew Vogt
Jan 1980 · American Mathematical Society: Memoirs of the American Mathematical Society Ibhuku elingu-235 · American Mathematical Soc.
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Using concepts from valuation theory, we obtain a characterization of all collinearity-preserving functions from one affine or projective Desarguesian plane into another. The case in which the planes are projective and the range contains a quadrangle has been treated previously in the literature. Our results permit one or both planes to be affine and include cases where the range contains a triangle but no quadrangle. A key theorem is that, with the exception of certain embeddings defined on planes of order 2 and 3, every collinearity-preserving function from one affine Desarguesian plane into another can be extended to a collinearity-preserving function between enveloping projective planes.
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