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Sporadic neighbour-transitive codes in Johnson graphs

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Abstract

We classify the neighbour-transitive codes in Johnson graphs \(J(v,k)\) of minimum distance at least three which admit a neighbour-transitive group of automorphisms that is an almost simple two-transitive group of degree \(v\) and does not occur in an infinite family of two-transitive groups. The result of this classification is a table of 22 codes with these properties. Many have relatively large minimum distance in comparison to their length \(v\) and number of code words. We construct an additional five neighbour-transitive codes with minimum distance two admitting such a group. All 27 codes are \(t\)-designs with \(t\) at least two.

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Acknowledgments

Cheryl E. Praeger was supported by Australian Research Council Federation Fellowship FF0776186.

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Correspondence to Cheryl E. Praeger.

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This is one of several papers published in Designs, Codes and Cryptography comprising the special topic on “Finite Geometries: A special issue in honor of Frank De Clerck”.

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Neunhöffer, M., Praeger, C.E. Sporadic neighbour-transitive codes in Johnson graphs. Des. Codes Cryptogr. 72, 141–152 (2014). https://doi.org/10.1007/s10623-013-9853-0

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