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01.09.2015 | Ausgabe 3/2015

Designs, Codes and Cryptography 3/2015

On a 5-design related to a putative extremal doubly even self-dual code of length a multiple of 24

Zeitschrift:
Designs, Codes and Cryptography > Ausgabe 3/2015
Autor:
Masaaki Harada
Wichtige Hinweise
Communicated by J. D. Key.

Abstract

By the Assmus and Mattson theorem, the codewords of each nontrivial weight in an extremal doubly even self-dual code of length 24m form a self-orthogonal 5-design. In this paper, we study the codes constructed from self-orthogonal 5-designs with the same parameters as the above 5-designs. We give some parameters of a self-orthogonal 5-design whose existence is equivalent to that of an extremal doubly even self-dual code of length 24m for \(m=3,4,5,6\). If \(m \in \{1,\ldots ,6\}\), \(k \in \{m+1,\ldots ,5m-1\}\) and \((m,k) \ne (6,18)\), then it is shown that an extremal doubly even self-dual code of length 24m is generated by codewords of weight \(4k\).

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