Quasi-symmetric designs and the Smith Normal Form |
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Authors: | A. Blokhuis A. R. Calderbank |
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Affiliation: | (1) Department of Mathematics and Computing Science, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands;(2) Mathematical Sciences Research Center, AT&T Bell Laboratories, 07974 Murray Hill, NJ, USA |
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Abstract: | We obtain necessary conditions for the existence of a 2 – (, k, ) design, for which the block intersection sizes s1, s2, ..., snsatisfy s1 s2 ... sn s (mod pe),where p is a prime and the exponent e is odd. These conditions are obtained from restriction on the Smith Normal Form of the incidence matrix of the design. We also obtain restrictions on the action of the automorphism group of a 2 – (, k, ) design on points and on blocks. |
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