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Three-weight codes over rings and strongly walk regular graphs

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arxiv 1912.03892 v1 pith:N2SPULBT submitted 2019-12-09 math.CO

classification math.CO
keywords codesgraphskerdockprimeringsstronglyalternativebuilt
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abstract

We construct strongly walk-regular graphs as coset graphs of the duals of codes with three non-zero homogeneous weights over $\mathbb{Z}_{p^m},$ for $p$ a prime, and more generally over chain rings of depth $m$, and with a residue field of size $q$, a prime power. Infinite families of examples are built from Kerdock and generalized Teichm\"uller codes. As a byproduct, we give an alternative proof that the Kerdock code is nonlinear.

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