
doi: 10.2307/3614888
The theorem to be discussed in this note depends only on the plane incidence axioms (with Desargues), the Pappus axiom, and the property that a point and its harmonic conjugate are in general distinct. When algebra is applied to the geometry it may be taken over any commutative field of characteristic other than 2.
foundations of geometry, non-Euclidean geometry
foundations of geometry, non-Euclidean geometry
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