Geodesic
Block designs with SDP parameters
Harold Ward1
1University of Virginia
The electronic journal of combinatorics, Tome 19 (2012) no. 3
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It is traditional to call a quasi-symmetric design with certain parameters an SDP design if the symmetric difference of two different blocks is either a block or a block complement. In this note, we delete the requirements on the parameters and demand just that the symmetric difference of two blocks be a block, a block complement, or either the empty set or the whole point set. We obtain the parameters of such designs and use the result to prove Kantor's theorem on the parameters of a symmetric SDP design. A spin-off of an exponential Diophantine equation considered by Ramanujan is at the core.
DOI : 10.37236/2266
Classification : 05B05, 05B30
Mots-clés : SDP designs, quasi-symmetric designs, parameters, Hadamard designs

Harold Ward  1

1 University of Virginia 
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     author = {Harold Ward},
     title = {Block designs with {SDP} parameters},
     journal = {The electronic journal of combinatorics},
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Harold Ward. Block designs with SDP parameters. The electronic journal of combinatorics, Tome 19 (2012) no. 3. doi: 10.37236/2266

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