| Title:
             | 
The cross-ratio in Hjelmslev planes (English) | 
| Author:
             | 
Jurga, Rastislav | 
| Language:
             | 
English | 
| Journal:
             | 
Mathematica Bohemica | 
| ISSN:
             | 
0862-7959 (print) | 
| ISSN:
             | 
2464-7136 (online) | 
| Volume:
             | 
122 | 
| Issue:
             | 
3 | 
| Year:
             | 
1997 | 
| Pages:
             | 
243-247 | 
| Summary lang:
             | 
English | 
| . | 
| Category:
             | 
math | 
| . | 
| Summary:
             | 
The cross-ratio in Hjelmslev planes is defined. The cross-ratio in the Hjelmslev plane $H(R)$ is independent of the choice of a coordinate system on a line. (English) | 
| Keyword:
             | 
Hjelmsev plane over a special local ring | 
| Keyword:
             | 
cross-ratio in Hjelmsev plane | 
| MSC:
             | 
51C05 | 
| MSC:
             | 
51E30 | 
| idZBL:
             | 
Zbl 0901.51003 | 
| idMR:
             | 
MR1600879 | 
| DOI:
             | 
10.21136/MB.1997.126149 | 
| . | 
| Date available:
             | 
2009-09-24T21:25:51Z | 
| Last updated:
             | 
2020-07-29 | 
| Stable URL:
             | 
http://hdl.handle.net/10338.dmlcz/126149 | 
| . | 
| Reference:
             | 
[1] Dembowski P.: Finite Geometries.Springer-Verlag, New York Inc., 1968. Zbl 0159.50001, MR 0233275 | 
| Reference:
             | 
[2] Ewald G.: Geometry: An Introduction.Wadsworth Publishing Company, Inc., Belmont, California, 1971. Zbl 0292.50001, MR 0365322 | 
| Reference:
             | 
[3] Hjelmslev J.: Die natürliche Geometrie.Leipzig, 1923. | 
| Reference:
             | 
[4] Hughes D. R., Piper F. C: Projective Planes.Springer-Verlag, New York, 1973. Zbl 0267.50018, MR 0333959 | 
| Reference:
             | 
[5] Jurga R.: Some combinatorial properties of conics in the Hjelmslev plane.Math. Slovaca 45 (1995), no. 3, 219-226. Zbl 0853.05018, MR 1361814 | 
| . |