In this paper we construct binary self-dual codes using the étale cohomology of μ2 on the spectra of rings of S-integers of global fields. We will show that up to equivalence, all self-dual codes of length at least 4 arise from Hilbert pairings on rings of S-integers of Q. This is an arithmetic counterpart of a result of Kreck and Puppe, who used cobordism theory to show that all self-dual codes arise from Poincaré duality on real three manifolds.
Homology, Homotopy and Applications, Vol. 14 (2012), No. 2, pp.189-196.
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