Abstract
Positive ℒω1ω definitions of point-inequality and noncollinearity in terms of collinearity, which are valid in plane hyperbolic geometry over arbitrary Archimedean ordered Euclidean fields, provide a synthetic proof of the theorem stated in the title and first noticed to be a corollary of a result from by R. Höfer.
Original language | English (US) |
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Pages (from-to) | 63-67 |
Number of pages | 5 |
Journal | Acta Mathematica Hungarica |
Volume | 100 |
Issue number | 1-2 |
DOIs | |
State | Published - Jul 2003 |
Keywords
- Definability
- Hyperbolic geometry
- ℒ-logic
ASJC Scopus subject areas
- Mathematics(all)