Shadow Codes over Z4
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Steven T. Dougherty; Masaaki Harada; Patrick Solรฉ
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Article
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2001
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Elsevier Science
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English
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The notion of a shadow of a self-dual binary code is generalized to self-dual codes over 9 . A Gleason formula for the symmetrized weight enumerator of the shadow of a Type I code is derived. Congruence properties of the weights follow; this yields constructions of self-dual codes of larger lengths