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On Blocking Sets in Affine Hjelmslev Planes

Boev, Stoyan, Landjev, Ivan (2012)

Serdica Journal of Computing

ACM Computing Classification System (1998): G.2.1.We prove that the minimum size of an affine blocking set in the affine plane AHG ...This research has been supported by the Scientific Research Fund of Sofia University under Contract No 109/09.05.2012.

The cross-ratio in Hjelmslev planes

Rastislav Jurga (1997)

Mathematica Bohemica

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.

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