最終更新日：2025/11/30
In my study of combinatorial designs, I often refer to the Bruck-Ryser-Chowla theorem, which says that for a symmetric (v, b, r, k, λ)-design, if v is even then k − λ is a square.
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In my study of combinatorial designs, I often refer to the Bruck-Ryser-Chowla theorem, which says that for a symmetric (v, b, r, k, λ)-design, if v is even then k − λ is a square.
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