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Difference sets and planar polarities
Published online by Cambridge University Press: 18 May 2009
Extract
A block design is a finite set p of elements called points, where |p| = v, together with certain distinguished subsets of p called blocks, such that
(i) each block contains k points,
(ii) each point is contained in r blocks, and
(iii) two distinct points are contained in precisely λ blocks.
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- Copyright © Glasgow Mathematical Journal Trust 1974