...(1)任意两点恰同时出现在一个区组中;(2)区组集可以划分为一些子集只(i∈n每个只是点集x的一个划分(称只为平行类(parallel class)).
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平行类
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点集V的划分称为平行类。
参考来源 - A packing (resp. covering) is called resolvable if its block set admits a partition into parallel classes, each parallel class being a partition of the point set V. Denote by RP(K,λ;υ,m) (resp.
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