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Published online by Cambridge University Press: 24 October 2008
The following is an alternative to Proposition II of the former paper. It does not assume the second of the initial assumptions in Art. 2, nor does it assume that the angles supplementary to equal angles are equal, which Hilbert regards as a proposition (Foundations of Geometry, p. 18 of the English translation).
* Proc Camb. Phil. Soc. vol. 22 (1925), pp. 964–9.Google Scholar