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Unital designs with blocking sets

机译:带挡块的整体设计

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摘要

A unital 2-(28, 4, 1) design has 28 points, each block has size 4 and every pair of points is on exactly one block. A blocking set in a design is a subset of the point set with the property that every block intersects the blocking set nontrivially but no block is contained in the blocking set. In this work, we classify the unital 2-(28, 4, 1) designs with blocking sets. We find 68,806 unitals with a blocking set. Of these, 68,484 have a trivial automorphism group.
机译:整体式2-(28,4,1)设计有28个点,每个块的大小为4,每对点恰好在一个块上。设计中的阻塞集是点集的子集,该点集具有以下属性:每个块都平凡地与该阻塞集相交,但该阻塞集中不包含任何块。在这项工作中,我们对带有阻塞集的单元2-(28,4,1)设计进行分类。我们发现68,806个单位带有阻止集。其中68,484个具有同质的同构组。

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