History and Philosophy of Logic 28 (1):19-30 (2007)

Authors
David J. Stump
University of San Francisco
Abstract
I trace the development of arguments for the consistency of non-Euclidean geometries and for the independence of the parallel postulate, showing how the arguments become more rigorous as a formal conception of geometry is introduced. I analyze the kinds of arguments offered by Jules Hoüel in 1860-1870 for the unprovability of the parallel postulate and for the existence of non-Euclidean geometries, especially his reaction to the publication of Beltrami’s seminal papers, showing that Beltrami was much more concerned with the existence of non-Euclidean objects than he was with the formal consistency of non-Euclidean geometries. The final step towards rigorous consistency proofs is taken in the 1880s by Henri Poincaré. It is the formal conception of geometry, stripping the geometric primitive terms of their usual meanings, that allows the introduction of a modern fully rigorous consistency proof.
Keywords Beltrami  geometry  consistency
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DOI 10.1080/01445340600758800
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References found in this work BETA

The Foundations of Geometry.David Hilbert - 1899 - Open Court Company (This Edition Published 1921).
On the Foundations of Geometry.Henri Poincaré - 1898 - The Monist 9 (1):1-43.
Frege and Hilbert on Consistency.Patricia A. Blanchette - 1996 - Journal of Philosophy 93 (7):317-336.
The Frege-Hilbert Controversy.Michael David Resnik - 1974 - Philosophy and Phenomenological Research 34 (3):386-403.

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