The cross-ratio in Hjelmslev planes
Mathematica Bohemica, Tome 122 (1997) no. 3, pp. 243-247.

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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.
DOI : 10.21136/MB.1997.126149
Classification : 51C05, 51E30
Mots-clés : Hjelmsev plane over a special local ring; cross-ratio in Hjelmsev plane 
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Jurga, Rastislav. The cross-ratio in Hjelmslev planes. Mathematica Bohemica, Tome 122 (1997) no. 3, pp. 243-247. doi : 10.21136/MB.1997.126149. https://geodesic-test.mathdoc.fr/articles/10.21136/MB.1997.126149/

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