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• W2963352971 abstract "Several intersection matrices of s-subsets versus k-subsets of a v-set are introduced in the literature. We study these matrices systematically through counting arguments and generating function techniques. A number of new or known identities appear as natural consequences of this viewpoint; especially, use of the derivative operator and some related operators reveals some connections between intersection matrices and the “combinatorics of creation-annihilation.” As application, the eigenvalues of several intersection matrices including some generalizations of the adjacency matrices of the Johnson scheme are derived; two new bases for the Bose–Mesner algebra of the Johnson scheme are introduced and the associated intersection numbers are obtained as well. Finally, we determine the rank of some intersection matrices. © 2012 Wiley Periodicals, Inc. J. Combin. Designs 20: 383–397, 2012" @default.
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• W2963352971 date "2012-05-01" @default.
• W2963352971 modified "2023-10-18" @default.
• W2963352971 title "Intersection Matrices Revisited" @default.
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• W2963352971 doi "https://doi.org/10.1002/jcd.21308" @default.
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