Quasi-symmetric 2-design

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This term is related to: incidence geometry
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A quasi-symmetric 2-design is a design of type (1,2) with constants l_1 and l_2 such that any two blocks intersect in either l_1 points or l_2 points. For example, a Steiner triple system is a quasi-symmetric 2-design with (l_1,l_2) = (0,1).

Relation with other properties

Stronger properties