Article ID Journal Published Year Pages File Type
10118355 European Journal of Combinatorics 2005 8 Pages PDF
Abstract
We show that a distance regular graph Γ with intersection array (21,16,8;1,4,14) does not exist. The proof uses algebraic properties of a positive semidefinite matrix related to the neighbourhood of a vertex of Γ.
Keywords
Related Topics
Physical Sciences and Engineering Mathematics Discrete Mathematics and Combinatorics
Preview
A distance regular graph with intersection array (21,16,8;1,4,14) does not exist
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