Abstract
It is shown that segment congruence can be defined by means of a positive existential definition in terms of segment inequality in several geometries over Archimedean ordered fields, and that it can be defined by means of a positive sentence in n-dimensional Euclidean geometry over arbitrary ordered fields.
Original language | English (US) |
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Pages (from-to) | 243-253 |
Number of pages | 11 |
Journal | Aequationes Mathematicae |
Volume | 72 |
Issue number | 3 |
DOIs | |
State | Published - Dec 2006 |
Keywords
- Infinitary logic
- Positive existential definability
- Segment congruence
- Segment inequality
ASJC Scopus subject areas
- Mathematics(all)
- Discrete Mathematics and Combinatorics
- Applied Mathematics