论文信息 - 2-arcs of maximal size in the affine and the projective Hjelmslev plane over ℤ25

2-arcs of maximal size in the affine and the projective Hjelmslev plane over ℤ25

It is shown that the maximal size of a $2$-arc in the projective Hjelmslev plane over $\mathbb Z$25 is $21$, and the $(21,2)$-arc is unique up to isomorphism. Furthermore, all maximal $(20,2)$-arcs in the affine Hjelmslev plane over $\mathbb Z$25 are classified up to isomorphism.

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