In this note, we demonstrate that every binary doubly even self-dual code of length 40 can be realized as the residue code of some extremal Type II Z4-code. As a consequence, it is shown that there are at least 94356 inequivalent extremal Type II Z4-codes of length 40.
- Doubly even self-dual code
- Self-dual code
ASJC Scopus subject areas
- Theoretical Computer Science
- Discrete Mathematics and Combinatorics