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New code upper bounds for the folded n-cube

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arxiv 1801.06971 v1 pith:DKIE5CXU submitted 2018-01-22 math.CO

New code upper bounds for the folded n-cube

classification math.CO
keywords squaredenotefoldedgammaupperalgebraapproachblock-diagonalizing
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Let $\Gamma$ denote a distance-regular graph. The maximum size of codewords with minimum distance at least $d$ is denoted by $A(\Gamma,d)$. Let $\square_n$ denote the folded $n$-cube $H(n,2)$. We give an upper bound on $A(\square_n,d)$ based on block-diagonalizing the Terwilliger algebra of $\square_n$ and on semidefinite programming.The technique of this paper is an extension of the approach taken by A. Schrijver \cite{s} on the study of $A(H(n,2),d)$.

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