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| Paper IPM / M / 2309 |
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| Abstract: | |||||||
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In this paper, we introduce some intersection matrices for
t-designs. Utilizing these matrices together with a modified
version of a backtracking algorithm, we classify all
6−(14,7,4) and 5−(13,6,4) designs with nontrivial
automorphism groups and obtain 13 and 21 such designs,
respectively.
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