Geodesic
A Room Design of Order 10
Canadian mathematical bulletin, Tome 7 (1964) no. 3, pp. 377-378

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

A Room design of order 2n, where n is a positive integer, is an arrangement of 2n objects in a square of side 2n - 1, so that each of the (2n - 1)2 cells of the array is either empty or contains just two distinct objects; each of the 2n objects occurs just once in each row and in each column; and each (unordered) pair of objects occurs in just one cell. 
Weisner, Louis. A Room Design of Order 10. Canadian mathematical bulletin, Tome 7 (1964) no. 3, pp. 377-378. doi: 10.4153/CMB-1964-035-4
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