Topic

Steiner system.

A type of block design, specifically a t-design with λ = 1 and t ≥ 2.

The journal

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In combinatorial mathematics, a Steiner system is a type of block design, specifically a t-design with λ = 1 and t = 2 or (recently) t ≥ 2.

Steiner system — A type of block design, specifically a t-design with λ = 1 and t ≥ 2.