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- W4287553896 abstract "Strongly walk regular graphs (SWRGs or $s$-SWRGs) form a natural generalization of strongly regular graphs (SRGs) where paths of length~2 are replaced by paths of length~$s$. They can be constructed as coset graphs of the duals of projective three-weight codes whose weights satisfy a certain equation. We provide classifications of the feasible parameters of these codes in the binary and ternary case for medium size code lengths. For the binary case, the divisibility of the weights of these codes is investigated and several general results are shown. It is known that an $s$-SWRG has at most 4 distinct eigenvalues $k > theta_1 > theta_2 > theta_3$, and that the triple $(theta_1, theta_2, theta_3)$ satisfies a certain homogeneous polynomial equation of degree $s - 2$ (Van Dam, Omidi, 2013). This equation defines a plane algebraic curve; we use methods from algorithmic arithmetic geometry to show that for $s = 5$ and $s = 7$, there are only the obvious solutions, and we conjecture this to remain true for all (odd) $s ge 9$." @default.
- W4287553896 created "2022-07-25" @default.
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- W4287553896 date "2020-12-11" @default.
- W4287553896 modified "2023-09-25" @default.
- W4287553896 title "On strongly walk regular graphs, triple sum sets and their codes" @default.
- W4287553896 doi "https://doi.org/10.48550/arxiv.2012.06160" @default.
- W4287553896 hasPublicationYear "2020" @default.
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