MATHEMATICA BOHEMICA, Vol. 122, No. 3, pp. 243-247 (1997)

The cross-ratio in Hjelmslev planes

Rastislav Jurga

Rastislav Jurga, Katedra aplikovanej matematiky, Podnikovohospodarska fakulta v Kosiciach Ekonomickej univerzity v Bratislave, Tajovského 11, 041 30 Kosice, Slovakia, e-mail: jurga@phf.euke.sk

Abstract: 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.

Keywords: Hjelmsev plane over a special local ring, cross-ratio in Hjelmsev plane

Classification (MSC2000): 51C05, 51E30

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