Geodesic
On a Restricted Class of Block Design Games
Canadian journal of mathematics, Tome 18 (1966) no. 1, pp. 225-236

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

Block design games have been developed by Richardson (12) and by Hoffman and Richardson (8), who proved a number of theorems concerning such games by studying the number of elements in a blocking coalition. Hoffman and Richardson listed as unsolved (except for PG(2, 3)) the following problem: What is the minimum number of elements in a blocking coalition of a block design game?This note considers blocking coalitions in those games that are dual to block designs having λ = 1 and r — k > 0. For such games certain blocking coalitions are shown to be related to sets of mutually disjoint blocks in the design to which the game is dual. In particular, for Steiner triple systems the largest odd-numbered set of mutually disjoint triples is shown to yield a minimum blocking coalition in the dual. 
Paola, Jane W. Di. On a Restricted Class of Block Design Games. Canadian journal of mathematics, Tome 18 (1966) no. 1, pp. 225-236. doi: 10.4153/CJM-1966-025-7
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