Abstract
The self-dual sentences of projective geometry are characterized in terms of their logical structure. This syntactical analysis reveals an unexpected relationship with graph theory, the self-dual sentences being precisely the geometric interpretations (in a reasonably natural sense) of arbitrary sentences of graph theory.
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Reference
Artzy, Rafael: Self-Dual Configurations and Their Levi Graphs. Proc. Amer. Math. Soc. 7 (1956) 299–303.
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McKee, T.A. Logical and graph-theoretic characterizations of the self-dual sentences of projective geometry. J Geom 6, 77–88 (1975). https://doi.org/10.1007/BF01919762
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DOI: https://doi.org/10.1007/BF01919762