Geodesic
Special Abelian Group Difference Sets
Canadian journal of mathematics, Tome 20 (1968) no. 1, pp. 1269-1275

Voir la notice de l'article provenant de la source Cambridge University Press

A abelian group difference set (abbreviated AGDS) (G, D) is a -subset D = {di}1k taken from an abelian group G of order v such that each element different from the identity e in G appears exactly λ times in the set of differences {d i d j -1}, where . Combinatorially, AGDS is equivalent to a design having an abelian collineation group which is transitive and regular on the elements and on the blocks of the design (1). 
Johnsen, E. C. Special Abelian Group Difference Sets. Canadian journal of mathematics, Tome 20 (1968) no. 1, pp. 1269-1275. doi: 10.4153/CJM-1968-124-2
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